Thanks so much for your time in this thorough reply!
I have come to all the same conclusions...
I was only looking for an external (second boot) option, but the virtual machine plan is the best I have come up with.
Despite ‘owning’ multiple previous versions of Parallels Desktop, I have of course had to subscribe £40 pa for the latest (basic!) version to get the hardware support from them even, and for a Linux system on modern hardware it runs pretty slow and hot!
The next bit is philosophical - you may want to skip it! :-)
Its about time Apple thought a bit more about their community and less about their share holders again I’m afraid...
It is disgusting of course that they (having taken so much from the open source community) are one of the only computer hardware manufacturers that deliberately avoid allowing their customers the necessary drivers!
Alongside their increasingly ridiculous prices and completely non-upgradable builds now, I regret that it may be time I moved back to PC...
Thats not to mention how darn unreliable the modern macOS is!!
Bring back Snow Leopard!!!
Basic functionality like the copy command no longer seems to be reliable nowadays!! Endless inaccessible files, permissions issues, or just plain bugs I’ve reported! In the copy command!!!!
I’m currently fighting to retrieve a lifetime of all my photos from my ‘Photos’ library before I quit the closed Apple ecosystem as thoroughly as I can - no, the ‘export’ function does NOT ‘Just work’...
Its all depressing...
Thanks again for your advice if you read this far!!