I don't know any method for converting EUR to USA, sorry.
Why don't google for a while? Maybe you can found more saves (USA OF COURSE) and inject it with JKSaveManager, Also, 3DS saves always are in .bin, just use the save file, you don't need extra data, because is NOT a save, as the name says, extra data saves replays, photos, and more from the SD/SysNAND.
If is a cartridge, if you have 3DS AR, why don't use it and forget about all?
of course, if is a cia, you need to find one save and inject it with JKSaveManager. <- Use this too if you don't have 3DS AR.
If i can, i'll post a save (is usa you 3ds/game?) Or i can post my save, but is semi-completed. (Not all completed, like changelles, or Classic in Very Hard mode with all characters) if i can of course, because im repairing my 3ds fromthe stick xvx