So... NDSSFC graphics mode 3 (Cropped, showing middle) + SNES BG Mode 5. I think I got it.
View attachment 1358
The little sprite that allows you to see the active letter in the name selection is a bit messed up, though.
View attachment 1359
Hint: The active letter is B!
This is committed to GitHub right now, waiting for the next release. I don't know yet whether I can deal with the sprite without breaking every single other sprite game in existence.
What does GBAtemp think?
Also, it's late, and I've been working on this way longer than I should have. Happy New Year.