Traditional fiat money (legal tender) has a forcing provision that maintains that it is the only method of payment accepted for your taxes, if that provision is not in there, then there is know reason to hold the currency (circulate it). A foreign currency with that stipulation will probably do everything you need it to do at least at the start. I think this would allow you to focus on the main problem which is going to be the "real" physical economy that actually produces the things that people need in order to survive and prosper.
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