Hi! Thanks so much for the kind words — really glad to hear Freeter was helpful for you!
Patreon recently removed the custom amount option from their UI, however it is still available via the direct link: https://www.patreon.com/checkout/alexkaul?rid=0&edit=1
Please give it a try.
For a one-off donation - you might just complete the payment and then cancel the membership. Every bit of support really helps and is much appreciated!