As a follow-up to my previous post on this -- I called AWA today to find out how to register to be self-employed. At first they said that since I am a non-EU citizen (and not being married to a Swiss like you, Greg) it is "not possible, sorry".
Then she put me on hold, and when she came back she said I
can register after all. I'm not sure if this was one of the recent changes and she didn't know or what caused her different answer, but whatever it was I was relieved!
She said I have to get the (yellow) form from my Gemeinde and then send it in to the Kantonale office. So I will go back to the Gemeinde and try again...