I agree a parallel economy, in the narrow sense, is not enough.

I see developing and negotiating decentralised protocols to replace centralised statist monopoly functions as the key preparation we can make here. 

"Shadow self-governance", by analogy with revolutionary shadow governments.

Yes, that's a gargantuan undertaking, but a lot of good work we can re-use has already been done by people who lived outside the grasp of a modern state.