Either using temples as banks is a problem and then it should be dealt with in a way that doesn't hurt the economy of the religion, or it is not and we can keep things the way it is...
This. I don't see using religions as banks to be a problem, because unlike what we had in Dwilight recently with the family gold being misused, no new wealth is created. It is merely existing wealth being moved in order to prevent its loss, which is something I feel every noble would want. After all, the more gold you have, the more you can use it on. And if the elders decide to take that pretty stockpile of gold and use it for something else, that's the risk you take.
