Keith give the above applet a go in IFTTT, it will move any spending against a US registered merchant back into your main balance from a pot.
As @Revels said, you’ll need the value of the transaction in your main balance but the value of the transaction will be withdrawn from your “Florida” pot shortly after. One other thing to consider is that the value of a transaction not in GBP can change slightly after a few days but the withdrawal will happen based on the value when you first make the transaction so there will be some variance.