Bluetooth midi

Hello,
how would you implement bluetooth midi (Ubuntu or RaspiOS) ? 
Raspbarry 3+ and higher has bluetooth (along with WLAN) capability. 
Would be ideal to use it with bluetooth Midi as many keyboards support that (BLE MIDI, WIDI "wireless midi") . 
Any hints are welcomed?
Br, Marcus

ps. (Seems Linux may not be unable to support Bluetooth Midi, but I am not sure.

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Hello,
how would you implement bluetooth midi (Ubuntu or RaspiOS) ? Raspbarry 3+ and higher has bluetooth (along with WLAN) capability. 
Would be ideal to use it with bluetooth Midi (BLE MIDI, WIDI "wireless midi") as many keyboards support that bluetooth MIDI. 

Br, Marcus

Here some implementations that I havent solved
1. Midi Keyboard that has bluetooth -> RaspberryPI via bluetooth
2. USB midi keyboard -> USB to WIDI (WIDI/wireless midi) -> RAspberryPI via bluetooth

Here implementation options that work, but dosent make sense as Raspberry already has bluetoot
3. USD mibi keyboard -> USB to Midi (WIDI adapater) -> WIDI adapter -> RaspberryPI  (needs two WIDI adapters)

Would be great to have your ideas how to solve implementation 1 (above).