Get out of my kitchen you flying ass
Try this "gbadoom.exe" build I edited. I got it to replace a map this time without the leaf error (which GBA Doom doesn't even seem to contain a LEAFS file anyhow, PSXDoom does though)
However, the part I edited didn't seem to work for some reason, I added a swastika in the center but when I load the modified rom it just had a mirrors effect in the center, then when I look away and look back the game freezes.
It's supposed to be this:
Maybe you'll have better luck, I've never modded GBA Doom 1 other than changing sprite offsets in the IWAD part.
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