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I'm trying to create a texture pack for Java edition that makes nether brick & derivative blocks have multiple randomized textures. All's been well so far, except when I encountered the walls. I don't exactly know what the blockstate JSON file should look like. I've tried multiple approaches. This was my first approach:

{
  "variants": {
    "": [
      {
        "multipart": [
          { "apply": { "model": "minecraft:block/nether_brick_wall/0/nether_brick_wall_post" }, "when": { "up": "true" } },
          { "apply": { "model": "minecraft:block/nether_brick_wall/0/nether_brick_wall_side", "uvlock": true }, "when": { "north": "low" } },
          { "apply": { "model": "minecraft:block/nether_brick_wall/0/nether_brick_wall_side", "uvlock": true, "y": 90 }, "when": { "east": "low" } },
          { "apply": { "model": "minecraft:block/nether_brick_wall/0/nether_brick_wall_side", "uvlock": true, "y": 180 }, "when": { "south": "low" } },
          { "apply": { "model": "minecraft:block/nether_brick_wall/0/nether_brick_wall_side", "uvlock": true, "y": 270 }, "when": { "west": "low" } },
          { "apply": { "model": "minecraft:block/nether_brick_wall/0/nether_brick_wall_side_tall", "uvlock": true }, "when": { "north": "tall" } },
          { "apply": { "model": "minecraft:block/nether_brick_wall/0/nether_brick_wall_side_tall", "uvlock": true, "y": 90 }, "when": { "east": "tall" } },
          { "apply": { "model": "minecraft:block/nether_brick_wall/0/nether_brick_wall_side_tall", "uvlock": true, "y": 180 }, "when": { "south": "tall" } },
          { "apply": { "model": "minecraft:block/nether_brick_wall/0/nether_brick_wall_side_tall", "uvlock": true, "y": 270 }, "when": { "west": "tall" } }
        ]
      },
      {
        "multipart": [
          { "apply": { "model": "minecraft:block/nether_brick_wall/1/nether_brick_wall_post" }, "when": { "up": "true" } },
          { "apply": { "model": "minecraft:block/nether_brick_wall/1/nether_brick_wall_side", "uvlock": true }, "when": { "north": "low" } },
          { "apply": { "model": "minecraft:block/nether_brick_wall/1/nether_brick_wall_side", "uvlock": true, "y": 90 }, "when": { "east": "low" } },
          { "apply": { "model": "minecraft:block/nether_brick_wall/1/nether_brick_wall_side", "uvlock": true, "y": 180 }, "when": { "south": "low" } },
          { "apply": { "model": "minecraft:block/nether_brick_wall/1/nether_brick_wall_side", "uvlock": true, "y": 270 }, "when": { "west": "low" } },
          { "apply": { "model": "minecraft:block/nether_brick_wall/1/nether_brick_wall_side_tall", "uvlock": true }, "when": { "north": "tall" } },
          { "apply": { "model": "minecraft:block/nether_brick_wall/1/nether_brick_wall_side_tall", "uvlock": true, "y": 90 }, "when": { "east": "tall" } },
          { "apply": { "model": "minecraft:block/nether_brick_wall/1/nether_brick_wall_side_tall", "uvlock": true, "y": 180 }, "when": { "south": "tall" } },
          { "apply": { "model": "minecraft:block/nether_brick_wall/1/nether_brick_wall_side_tall", "uvlock": true, "y": 270 }, "when": { "west": "tall" } }
        ]
      }
    ]
  }
}

 When that didn't work, I tried this:

{
 "multipart": [
 {
 "variants": {
 "": [
 [
 { "apply": { "model": "minecraft:block/nether_brick_wall/0/nether_brick_wall_post" }, "when": { "up": "true" } },
 { "apply": { "model": "minecraft:block/nether_brick_wall/0/nether_brick_wall_side", "uvlock": true }, "when": { "north": "low" } },
 { "apply": { "model": "minecraft:block/nether_brick_wall/0/nether_brick_wall_side", "uvlock": true, "y": 90 }, "when": { "east": "low" } },
 { "apply": { "model": "minecraft:block/nether_brick_wall/0/nether_brick_wall_side", "uvlock": true, "y": 180 }, "when": { "south": "low" } },
 { "apply": { "model": "minecraft:block/nether_brick_wall/0/nether_brick_wall_side", "uvlock": true, "y": 270 }, "when": { "west": "low" } },
 { "apply": { "model": "minecraft:block/nether_brick_wall/0/nether_brick_wall_side_tall", "uvlock": true }, "when": { "north": "tall" } },
 { "apply": { "model": "minecraft:block/nether_brick_wall/0/nether_brick_wall_side_tall", "uvlock": true, "y": 90 }, "when": { "east": "tall" } },
 { "apply": { "model": "minecraft:block/nether_brick_wall/0/nether_brick_wall_side_tall", "uvlock": true, "y": 180 }, "when": { "south": "tall" } },
 { "apply": { "model": "minecraft:block/nether_brick_wall/0/nether_brick_wall_side_tall", "uvlock": true, "y": 270 }, "when": { "west": "tall" } }
 ],
 [
 { "apply": { "model": "minecraft:block/nether_brick_wall/1/nether_brick_wall_post" }, "when": { "up": "true" } },
 { "apply": { "model": "minecraft:block/nether_brick_wall/1/nether_brick_wall_side", "uvlock": true }, "when": { "north": "low" } },
 { "apply": { "model": "minecraft:block/nether_brick_wall/1/nether_brick_wall_side", "uvlock": true, "y": 90 }, "when": { "east": "low" } },
 { "apply": { "model": "minecraft:block/nether_brick_wall/1/nether_brick_wall_side", "uvlock": true, "y": 180 }, "when": { "south": "low" } },
 { "apply": { "model": "minecraft:block/nether_brick_wall/1/nether_brick_wall_side", "uvlock": true, "y": 270 }, "when": { "west": "low" } },
 { "apply": { "model": "minecraft:block/nether_brick_wall/1/nether_brick_wall_side_tall", "uvlock": true }, "when": { "north": "tall" } },
 { "apply": { "model": "minecraft:block/nether_brick_wall/1/nether_brick_wall_side_tall", "uvlock": true, "y": 90 }, "when": { "east": "tall" } },
 { "apply": { "model": "minecraft:block/nether_brick_wall/1/nether_brick_wall_side_tall", "uvlock": true, "y": 180 }, "when": { "south": "tall" } },
 { "apply": { "model": "minecraft:block/nether_brick_wall/1/nether_brick_wall_side_tall", "uvlock": true, "y": 270 }, "when": { "west": "tall" } }
 ]
 ]
 }
 }
 ]
}

Neither worked, so I'm kind of lost on the solution. Any help is appreciated.

Firstly, once you put more than just textures into your pack, it's no longer a Texture Pack, it becomes a Resource Pack.

You did the randomization wrong. And the order of multipart and variant, as you can only use one of them in a model.

It should look like this:

{
  "multipart": [
    {"apply": [{"model":"example0","weight":15},{"model":"example1"},{"example2"}], "when":{"up":"true"}}
  ]
}