Even full node update messages are too big for NVIS unless there are unusually good ionospheric conditions. (NVIS works via the ionosphere acting as a mirror for certain length radio waves. But the conditions are variable, the mirror gets fogged up to various degrees).
Doing an SPV node messages over near-vertical incident skywave (NVIS) is technologically feasible, though not 100% reliable. Doing a full node is probably infeasible unless you use Blockstream Satellite or similar for the big messages.
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I wonder if those challenges could be overcome by designing a sidechain that uses less bandwidth. Like LN optimizes for low speed/cost, the sidechain would optimize for low bandwidth.
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Ambitious but I think it could work, using less bandwidth and dealing with unreliable messages (retries and trying different routes). Possibly could use Lightning itself, although I haven't looked into that.
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How about UHF?
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It's much shorter range than NVIS, you are much less likely to find another node to talk to. If you find a partner and both locate yourselves on each side of a censored internet gateway you could do full node msgs, but that's a costly thing to do.
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