I do not see how you have addressed the problem of servers having to either withdraw to LN immediately or force everyone to use their trusted mint, if they do not want to get scammed
Discussion
I don't see that as a problem. I am building a tokenized payment system that is an alternative to the internal account system of a payment provider. I am trying to facilitate payments - the faster that funds move in an out, the better. Having to custody anything is a necessary evil to minimize.