>it would be vanishingly unlikely that a person or group of people had managed to reconstruct it with enough accuracy that they could write an entire manuscript in an invented writing system that happened to mirror it
What about the case where the author of the Voynich Manuscript still spoke the proto-human tongue, i.e. that it was authored in an environment where that language was still relatively active, and has since dissipated? We do know that there have been communities of humans that have persisted since pre-history - the Sentinelese. Its an idle speculation, but one has to wonder if their language has been studied well enough to have been applied to the Voynich solution.
Anyway, thanks again for the insight. Protong is a pet hobby of mine, but I don't take it fully seriously - I just happen to think the idea of an encoded, pre-historic language to be found in all ancient art is fascinating, even if not legitimate in terms of scientific accuracy. Its the programmer in me, I suppose, which hopes to see the assembly language instructions that make up a broader set of symbols...