Simple modification to supporter

I searched the forum and see this is much desired, but there are no straight and direct answers about how to implement the necessary changes

I'd like to charge a supporter amount upfront, than a different recurring amount monthly. I'd like to remove the other billing options.

Example: $100 single payment and $20 a month recurring.
A yearly option would be okay, but three months is overkill.

It would be an immense help to get a direct and clear solution :slight_smile: