If that can't be done by the casino, then maybe somewhere else there would be a developer who can develop an application to do that. i mean like a third party application that will manage ypur fund. Set maximum losses per week or day.
I think it's viable to integrate with online casinos nowadays especially with the help of crypto blockchains and such. Transferring of fund might be just easier.
I'd rather avoid third parties who will manage my funds. It is my money, and I should be responsible for the money and no one else. And that is also what gamblers or people who are gambling must do. The casino cannot follow or give you what you want to limit your losses. But casinos have warned you to gamble in moderation and not to overdo it. But because gamblers have a passion, that makes them forget to control themselves. And if it's like that, the casino can't do anything about it and leaves it entirely up to the user's choice. And we are responsible for the money we have, so it is we who need to manage the funds properly.
so far, we haven't seen any casino or gambling site that would offer such feature. and it is quite obvious that this is not part of their concern as they would want their players to spend more on their site.