Exactly the same thought…I purchased my 2022 MSLR about two weeks ago, and interestingly the prior owner went with a square setup on 20” aftermarket wheels. I had the same idea even before I found this particular car, but really like the OEM Arachnid wheels, and had planned to find a partner who also bought a staggered Arachnid setup and then swap two wheels with the other so that each ended up with a square setup.
Let me know if you confirm it can be done (with either width)!