Just to clarify, as the OP: I don’t want a Windows computer. Everything I’ve done on computer in well over 20 years is on Mac systems, my tablet is Mac OS, my records are in Mac programs, and I have no desire whatsoever to spend whatever bits of cash I can scrape up on a computer running on a different system.
So a “new cheap PC for Windows” may be a good solution for others but it’s not a solution at all for me.
And I really will have to come back to this another time (though obviously before May, if only at least to try logging in on the iPad) as this week is already out of hand entirely with additional things I have to deal with.) Thanks to all for the assorted Mac suggestions and I may get back to you eventually.