I don’t know the answer to this unfortunately.
But at Monzo’s open office event in December, Tom mentioned that they would be announcing a partnership with a provider of an international money transfer service (my guess is TransferWise but only because they also work with N26 & have an API). If you could use that sort of service, would that work for you?
If not, it would be interesting to hear what makes Swift payments, in particular, useful for you.