And as far as exchanging it for cash, this is useless. 1) You cannot do anything with cash other than buy small purchases, 2) They will eventually ban cash, so you will have nothing
As far as I can tell, you are trapped in BTC. Since it's too much too cash out, and it's too little to start some sort of tax haven structure (and there's still risk anyway)
I think you are fantasizing. The amount of cash can be reduced or a very small country like the Vatican can be controlled. But it can't be done in most countries or unions like USA, Russia, Europe. As soon as governments start imposing restrictions, shadow markets will appear.