How can you do all of these things without Internet access? I think that's the basic question.
That you can circumvent bans from Appstores/Exchanges etc. is not the issue; but complete lack of Internet access might be.
Oh. If you're talking about a 100% complete restriction of the internet, then that country has a lot bigger issues to solve than to be worried of Bitcoin.
With that said, satellites could work like you said, and also probably SMS transactions via platforms like Samourai. Though I personally really can't vouch for both as I haven't tried either.