This all completely falls apart when you point out that the thing they want to illegally trade isn't replaced by knick-knacks and the other stuff that they're stealing from the 2nd Prince.
Everyone is getting what else they need from the new store anyways so there won't be a reason for them to complain - you haven't actually increased the amount of money in circulation - and besides, how is money circulating back into the economy if the store is taking all the payments, bringing in stock from outside or outright stealing it? Maybe you build an orphanage and feed the kids, but you're doing it pro-bono and paying yourself to do it and this just means everyone buying materials and supplies, outside of the nobles who are paying for random shit are slowly going to go out of business
The economy is going to literally run out of money before anything else that you want to accomplish, and at worst they'll just double down on the slave trade so you have to stop that directly anyways