Questions before buying

The Organelle M uses Raspberry Pi Compute Module 3. The other rPi modules don’t have the same connector so swaping modules is not really possible.

Are you trying to sync MIDI clock? The Organelle M is a USB host (type A connection) so if your mixer is a USB Device (type B connection) you can sync that way. Not all Organelle patches generate or use MIDI clock.

More here: How To : PD - using an external USB audio interface

You would need to route your MIDI data in bitwig.