Hello Joker and welcome to the Zcash Forum!
These concerns are widely shared among the Zcash community, see also this thread where we suggested some possible solution.
Still there is no official communication/plan from ECC or ZF that I am aware of, and I think it’s time for putting down a war-game scenario like you suggest.
The ban of privacy coins from EU and US is a milestone in the ECC roadmap that has not been considered.
I am sure ECC and ZF will fight when it will happen but having a plan is always better.