Well you can't have it both ways. Either you have a classical economy that only grows when it extracts the wealth of another nation, or you go with localised models that issue debt, without risking reserves.
As mentioned, if you want to pay in hard currency or commodities, that's fine, but you only have a fixed supply of said commodities and when that runs dry, you'll have to seize it from others to facilitate your growth.
Want that new warship? Well if you're not issuing debt, then you're paying with gold, or Bitcoin.
Then you have a depreciating boat, no hard assets reserve and you collapse.
See British, Spanish, Portuguese