Why don't you just exchange Bitcoin for cash, and then top up your bank accounts with cash via ATMs? It seems to me that this way banks won't be interested in sources of income.
At least in my country, banks only have questions when funds are deposited to the card from cards of people who often interact with cards of other people. This is why you are under surveillance. Topping up cards at ATMs does not raise any questions.
I could have directly exchanged bitcoin to cash if I wanted to, but it has some risk factors such as being a victim of scams or being kidnapped.
Some people I know have been victims of such incidents before and since crypto currency is illegal in Bangladesh, they could not take any legal action for the incidents that happened to them.
Because, if they want to take legal action, they will first have to answer why they are involved in cryptocurrency.
So to avoid this risk, I sell my cryptos on binance p2p and later cash them out from the bank. Even then I have to face issues with the usages but there is no others options right now for me or our local poeples.