The following WC forum members have reported using WC 3.1.3 and Monterey successfully:
- Steve
- Aardvark
- PeggyD
- CPVSteve
- ColdnFrosty
- 271249horst
- Marosan
- drewas
- seejayess
A forum search may result in others.
Edouard gave you some specific steps in Post #23. I cannot see from your Post #24 if you followed all of them or not. As I’m sure you are aware from your other posts, many times all steps must be followed and in the correct order. One thing I think Apple has made more difficult in Monterey is removing the System Information function from the Apple menu. If that function is still there, it is the easiest way to see if old extensions are still installed.
Hoping some more folks come through with any details of their upgrade to WC and Monterey.
Edit 3-15: added two more using WC 3.1.3, Python3 and Monterey.