The feature support page shows Bluetooth as working in the M2 Airs. Is there a particular feature or compatibility issue that you’re waiting on?

Do you need to control the temperature remotely, or just switch it on? If the latter, could you just leave the existing potentiometer / power switch always in the on position and add a new zigbee relay to cut power to the whole works on & off?

Six years is recent enough for decent virtualization support at the CPU level, so it’ll probably run within 5 to 10% of the “native” performance you could get with Boot Camp. If you have enough RAM to give the VM a decent amount it should be fine.