In my training, I somehow came up with the erroneous notion that once a closed poly-surface was created, it could only be manipulated by external means like cage edit… and of course that wouldn’t work for me here. So that deviated me from the obvious places to look. It’s a touch embarrassing; but thanks to you, I found the _SolidPtOn command.
Now its just a problem of selecting what I want and deselecting what I don’t want, as it’s pretty complex. That’s a good problem to have tho!