Clearly your situation of trying to obtain residency in the Comoros by investment would raise eyebrows at banks whose job it is to monitor tax compliance. I don't think you're describing an everyman kind of scenario.
I also don't entirely understand why you're even rationalising the purpose of the account to the bank. Can't you just open an account for any purpose? It takes me five minutes to open an account online, and I've never once been asked to explain or justify anything (in many decades). I use my accounts robustly, including for international transfers (I've lived on two continents in the last four years). I even once paid for a trip to North Korea out of an ordinary bank account. My bank never batted an eye.
Maybe you're just dealing with a bad bank, or an over-regulated banking system (Europe?). You realise you can walk into any US bank right now and they'll just open an account for you with nothing more than some accurate ID? And the same holds for much of the rest of the world? The problem you're trying to solve is already solved.
>> The other example is somewhat concocted but rooted in the time I spent in Iraq and noting almost all transactions are performed outside the banking system, in part because banking is inaccessible and people often don't have access to KYC documents.
Unsophisticated semi-literate farmers are the last demographic anyone is reasonably expecting to open their crypto brokerage accounts and start trading synthetic USD derivatives.
These are just not realistic scenarios. This is what people say when they rack their brains trying to come up with some reason stablecoins might be useful. I feel like you're just confirming that they're a solution in search of a problem.