This seems sound for one off transactions, but I'd be interested in how to make this work with subscriptions, assuming you don't want to take the PCI burden of holding the raw card details - is it a case of asking all your customers to resubmit their details to the new payment processor?

I guess in the case of the orchestrator you linked they retain the card details and can then charge using any of n processors, though I'd be interested in thoughts from the overall thread where people are advising to be ready to change payment processor