So far so good. Since my X drive is gynormous, I backed up my C:\bb and C:\RealBand folders in a subdirectory (unimaginetevely called x:\22-10-04-biab-bak) and I placed the originals into the trash, without emptying it yet.

It seems to work. Under help I still see the "Deactivate Band in a Box" message, which tells me my activation crossed over.
The only thing I had to do, was to change the originating folder in my start menu takes me to the correct file.

All in all, pretty painless. I wish I could say the same about other areas of BIAB. As much I have loved this program for half my life, there are things that still befuddle me. I wish I had the money to upgrade to the full version (or rather, I wish I could make a strong case to myself and my wife as to why dropping $500 makes sense) as every song I compose seems to need a style I don't own.
I know why they don't sell styles individually, but I wish they did.

Thanks again. If anything bad happens, I'll update the post, but it looks like things are going well.