Start by saying it works;
Axoloti MIDI DIN OUT does power the Yamaha MD-BT01.
Don't have a mac with Bluetooth LE, so only used iOS devices.
Playing notes OK, sending 10/12 MIDI CC's seems to "blow up" (BT communication) ehehe.
How low bandwidth Bluetooth LE is? 8x MIDI (not my field)
But again it works.
Only device that i found NOT working is iConnectMIDI2+, does not provide enough power...weird.