Hey Jerry,
At one time I owned a SEM CIAO w/wireless MIDI. The manufacturer was KENTON, from the UK. The MIDI system itself worked OK but SEM (in their infinite wisdom) put the batteries inside the accordion so when charging, the accordion was unusable.
The KENTON cost abt $1200.00 but don't think they are made any longer.
Of course LIMEX has one at abt the same price or more.
I'll sned you a PM with contact info for a guy who uses wireless MIDI He lives in Iowa and can tell you all abt it and where to get one!
Don P
_________________________
GENOS, Roland FR-8X V Accordion, Bose Compacts.