@ Capricorny

I agree whole-heartedly with your 'proofs of concept' approach.

I've been using the idea #2 in my post #2 for some time now,
and it works fine for me. I could post an example.

Do you suppose we need a unique forum for this, or should we
just use one of those which already exists, like this one?

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With regard to your concern on 'wear' on USB devices, are you
aware of the SD manufacturers' ass'n warnings about using Microsoft
or Linux formatting as opposed to manufacturers' ass'n formatting?
I can dredge up a link if you are interested.