EDIT: Damn. I tried, an failed.
Here's what I did:
Unpack BDX using DSLazy
Unpack JwtB using DSLazy
Open up BDX's extracted contents and JwtB's extracted contents
Copy the 2D, 3D and gfx (?, I forgets) located in the 'English' folder over to BDX
Repack it as a ROM
Run using Wood/YSMenu
RESULTS:
Wood: I made 2 for this. One where I also copied over the header info as well. Wood made a 32mb save file. I think I know how YWG fixed this. Anyway, I then deleted the 32mb save and copied my 8mb Daigasso save over. Wood over-wrote it and made another 32mb save. D :< . So then I did one again with no header info, so it was still the Japanese game header. It booted, but hung on a
white screen. (I think I still used my old BDX save fore this too, that could maybe be part of the problem)
YS: I only tested my Jap header one using YSMenu, and it hung on a
black screen. Damn.
Black and White are some keypoints, white (i think) means it didn't get into the game, black means it did, but crashed.
I dunno, I did something like this a while back with EBA, removed all song info for mission 1. The Agents were dancing in front of a black screen, no hit markers, eventually it ended the song and graded me. Then it crashed. >_>.
Well, if anyone figures something out, post it here for everyone, alright?
;D
I'm gonna keep trying, good luck to all and remember;
Wealth and Glory to the Winner.