First off, excellent, excellent job on your works. Owning several of those cards, you've helped me greatly in converting them all onto one card, no matter which brand I choose. Just to give you a head's up, after doing some testing with my G6 DS Real (yes, review will be up sometime soon), I see that M3DSS/R4DS saves are the same as G6DSR, sub 512Kbyte .sav for 512Kbyte .0 obviously. Might be helpful to add for another update, but I would ask anyone else who has a G6DSR to help test this with various games.
Tested successfully:
Castlevania: Portrait of Ruin (USA)
Clubhouse Games (USA)
Metroid Prime: Hunters (USA)