To be sure we're all on the same page, I am actually referring to this card: https://www.americanexpress.com/icc/...ency-card.html

The card is actually serviced and issued out of the UK, but available to many markets worldwide. An applicant must have an existing Amex card from another jurisdiction for six months prior to applying.

Now that I think of it, he may not be eligible as a resident of Spain (they excluded most, if not all EU countries recently), but perhaps this is solvable with some creative thinking, although most likely not.