As you can see from the gfycat link, I've bypassed the structure block's limit of 32x32x32 and loaded a 31x252x32 structure with 1 block. I used observer blocks to power the structure blocks inisde a loaded structure to create a chain reaction.
When I was making a structure block based map(https://www.planetminecraft.com/project/find-the-button-the-portable-map/), I discovered that observers give off a redstone signal when it is placed and decided to use it to activate command blocks when a structure is loaded. Since default command blocks and structure blocks only activate when their block states change from unpowered to powered, the observer is perfect for this situation.
If you want to see the loading process ingame, here's the map download link.
The preset I used for this world is stored in a command block near the structure. I preferred to use it because the dark sky made by the sky(end) biome made the white border lines easier to see. The obsidian floor was also good for recognizing the lines.
EDIT: This technique was also discovered by Tyruswoo, He featured it in his video() a while ago and I didn't notice it until after I posted this thread