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.
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.
