I had a similar issue as yourself, using touchess_lm and the device not registering, so any third party apps (albeit the few that remain !) would be moot regardless.
out of a bit of messing about I figured that the device was still registering in some crude way but not interacting. so this is what I did, for osx Monterey build 12.2.1 (public not beta).
- load up your leap motion controller and the software
- in leap software, go settings : troubleshooting : recalibrate device
- keep that window open and restart your m1 Mac running Monterey
- when you restart it should pickup on the recalibrate window - but I could just close this window (not the leap program itself, and it worked.
so requires a restart for usage. Also the caveat I found is that with touches_lm it now wants to become the mouse, as opposed to a secondary pointer that was a green circle and gave me feedback, but this is just a minor thing for now as I'm messing around with it.
hope the new software comes out and maybe even some beta testers are needed.
hope this helps you out.