It could be very nice if you arrived to do that. I love Recalbox and batocera and for me if batocera can play recalbox theme it will be the better of the two world, because to many system is missing for me to recalbox and i prefere batocera for that but the recalbox theme configuration is a realy cool think.
Reload theme without restart the system could be great to.
and the coolest think ever could be support of video in themes like in retropie