I’ve been using a magsafe card holder ever since I switched to GrapheneOS. Been working surprisingly well - I thought I’d forget my cards way more often, but it’s actually fine.

The only two negatives I’ve had so far is that my snake got her head stuck in my card holder’s finger loop once. And the powerful magsafe magnet fried the magnetic strip on a loyalty card I have in there, so the cashier has to type my customer number in by hand every time.