Ages ago I asked after this, and have finally gotten a workable answer:
https://github.com/TheJoeFin/Windows10-Community/issues/17#issuecomment-2281136711
which I've just tried, and which worked, so Firefox will now be my browser of choice.
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Annoyingly, yesterday's Windows 11 update toggled off "Let me use my pen as a mouse when it's available", so this stopped working, so I'm back to leaving Settings running at that page so I can turn that feature on/off depending on which application I am using....