The idea of the ATX extender is a great idea, as is the SSD. Be good to know if the SSD would work. If I see a cheap Beomedia 1, I will but it to do some tests on. Like yourself, I can see no reason why it will not work on Windows 10 or 11, as long as the driver works. I will keep an eye out for a cheap unit.
Thanks for all your help.