Thanks for your suggestions.
After I had cooled down a bit I booted the SD in question which was somewhat smaller than my original Win10 install size. I didn’t think it would boot properly being several GB’s smaller. But it did boot and after several updates and reboots, it runs. I have just backed it up to an old IDE drive via USB which took forever and will not be using it soon. I decided that since I hardly ever use Windows and it’s a small notebook SSD I would just have 15.4 Leap installed. While I am reasonably sure that Leap co-exists with Windows, I am never sure what tricks Microsoft will engage in killing all OS competition.