You could also go the route of the Tesla key 3rd party bracelets and rings people make online out of key card chips. They are a bit pricey, but reputable brands do work as a backup.

I would also recommend a slightly larger MagSafe compatible wallet that can hold 5 cards 💳 (I recently got this one and love it):

Sinjimoru 3 in 1 Magnetic Wallet https://www.amazon.com/dp/B099K8HCQT/