I recently updated a tool for Amidst called Seed Hunter: https://github.com/Zodsmar/Amidst-Seed-Hunter-1.13
Within about 15 hours of searching I came across 5 seeds that had the criteria needed however this was the only seed with everything clustered in a basically just the negative side of things. You spawn in the Mesa Jungle area. If you guys would like to see the other seeds I found let me know.
This seed has every single biome and almost all M and M+ varients too. By far one of the best seeds I found with biomes so close so far! Enjoy guys!
For now here is the seed for easy copy paste: -7407223387392437721