You could put the game when it's in early access to pay here inside itch.io, as I pay and choose an option that doesn't require a credit card, but rather a quick payment, you can be sure that it will be easier for people to want to pay than paying monthly, especially because many people will pay only once, even if it's with the price of an installment. I say this because I could pay but because my card is new I still don't have a limit to pay something, if it were a quick payment I would have already paid at least twice when early access was released.