I think that if government declares it illegal to accept bitcoin, that is the end of bitcoin in that country. No one is going to risk prison merely to accept bitcoin. The consensus will be unsustainably small, there will be no one to trade with except a few other extreme risk takers. It'll be like 2010 except there's far more risk and far less benefit (the price will not increase again like it did back then). End result is bitcoin dies in that country.
It still flourishes elsewhere of course, and the iron-fist country forfeits economic growth. The more countries that ban it, the more a lax country can benefit by allowing it. But let's not fool ourselves into thinking bitcoin can locally withstand the iron fist.
I understand that you're not willing to put in the work needed to make Bitcoin's resistance to local oppression more robust.
You're making an error when you assume that just because you're not willing to do it that nobody else is willing to do the work either.
I don't think there's anything that can be done. What did you have in mind?
Let's say a dictator declares, "anyone who accepts any currency other than the state currency is subject to arrest and 10 years in prison".
It doesn't matter what awesome crypto tech we come up with. It will never see the light of day. Law enforcement shows up at the shop, if the merchant lets anyone walk out of there without having paid in the state currency, he goes to prison. All merchants who are not otherwise breaking the law, being rational, will not risk 10 years in prison just to bypass chargebacks and 2% fees.
Maybe you have some creative solution for this.
Granted I think this is all hypothetical, I don't expect any first-world economy to actually pass such a law. I'm just saying the technique would be effective against bitcoin.