Your interest is duly noted there, Mate ... and I thank you for expressing it.

Glancing back over this thread I realise that I may not have laid out the stall very clearly. But I am really talking about two aspects here:-
1) Volunteering to assist in tech support medical charities
2) Banding together* to share the spoils available (if any) in carrying out the same
In either case (and as I have mentioned before) the real problem is
funding. In short, if money wasn't a problem, there would be no end to the Good Deeds we could engage in.
So, I guess what I am really asking of folk here is that they:-
1) Win the Lottery
2) Make a handsome donation (only a £ million or so) to the Cause!
In similar vein, I am also interested in the idea of a "not-for-profit" co-operative providing independent technical services (to
any customer, not only charity groups). My interpretation of the meaning of "not-for-profit" being that we charge for services at lower rates than profit-generating companies, as we pay ourselves only the minimum we actually need, whilst ploughing everything else back into the venture. That is, no shareholders and the like getting rich at our expense. Again, with shared ownership (and shared responsibilities).
But I don't expect much of a response to
that idea, as I have been looking for such like-minded souls (without success) for more years than I care to remember.
*
A co-operative. No-one is "boss". Fair shares for all, with the lead taken as and when needed by the person most able to provide that leadership.