I reckon if I had to do something like that I'd choose a geared down BSA Bantam. Slow as, but almost totally indestructable, virtually nothing to go wrong, if something does break it can almost certainly be fixed by a village blacksmith, they'll run on anything including kerosene, and I never found any terrain that they couldn't get through.(They used to be quite popular in trials)
Simplicity lightness and robust crudity are what's needed me thinks. And the lack of power would force you to cut your load to a bare minimum.
I don't think any modern bike could match the Bantam for sheer survival factor. Always breaking down, unlike modern bikes, but , unlike modern bikes , when it does break down it doesn't need more than the simplest of tools to fix (plus a good kick or two) . And an off never does any damage to a Bantam (or, at any rate, after a bit you can't distinguish new damage from old damage, and they still keep on going anyway). The other advantage is that if you use tyre with stiff sidewalls they can run reasonably happily with no air pressure.
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