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+1 thank you very much @Digipip I really appreciate your efforts. It is very rewarding to get the most out of hardware, so many facets to that reward: community, intellectual challenge, satisfaction as well the environmental and financial merits. There's definitely that spirit in myself. Thanks again!
One last thing. If, in the next while, the majority of others here find a particular answer useful, I will be happy to mark it as the accepted answer, to give further reward for your amazing efforts. This will help even more people see which is the definitive answer. Most appreciated.
...Myself, I'm sorry that I won't be testing further work on this problem. I am making the transition to Apple Silicon by getting a Mx based mac in nearish future, which will forfeit running Windows on Bootcamp. so no WSL2. I have a separate Windows machine so will run WSL2 on that. And also another machine with Windows and Ubuntu where I'll upgrade it to Ubuntu 22.04 and have Windows 10 in a separate partition. I'm very grateful for the continued support. This Q&A is rich with options for others, thanks to your contributions!
..Though I might hope that with asahi linux, support for Apple File System in Linux kernel like what was done with NTFS as I posted above, would avoid the requirement for partitioning if both OSs, macOS and Linux are installed on the same partition. That would remove some "complexity" and then the focus is on the boot menu and loader.
+1 upvote @Digipip OP here! thanks for picking this up.With the advent of Apple Silicon eventually ending support on x86 macs, I imagine there is renewed motivation to run Windows and Ubuntu on mac hardware to repurpose and maximise the useful life out of that older hardware. Though the former, Windows, is also being superseded by Windows 11 - of which I would not think any mac x86 hardware supports the requiirements fully and officially. This Q&A also has use for asahilinux.org which is being developed to support Apple Silicon, to choose between booting macOS or Linux at boot time...
