Disclaimer: Proceed at your own risk. Fried consoles, bans, or anything that may happen, it's not on me.
Terms:
Animal Crossing New Horizons = ACNH
FitGirl Yuzu Repack = FGYR
Nintendo Switch Console = NS
This method could potentially work for transferring other backups from Yuzu to console...
@Xdqwerty, You do realise that just about any SD card formatted to FAT32 should work with the DSi. I think, 16GB or 32 is about enough to load all of your games.