SubStar allows the use of prepaid cards and also has a page dedicated to alternate options here:
https://getsby.com/en/creator-platform/subscribestar-how-to-pay-without-paypal-o...
I hope that can help!
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I've tried Prepaid cards before, and they're always a huge pain in my experience. (I tried them before for Kickstarter.) But I will look at the page you linked, hopefully there will be some way for me to contribute still that way. EDIT: Hm, doesn't look like it offers anything I would want to go for, unfortunately…