Well, Boosty is actually a pretty good alternative from what I know. At least subscriptions there seem to be way more forgiving. Well, from my experience at least. Plus I think Itch here has the same option, no? I mean, you can lock the recent content behind subscription as well.
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Yeah, the main downside of Patreon and KoFi is that their payment methods are very restrictive. While Patreon allows PayPal and credit cards, KoFi is PayPal only, which is, frankly speaking, pretty depressive since it does not accept payments from anything I know and use. Boosty is way more sociable in that regard.
Checking into itch's systems, it seems a little rigid. Every way I look at it has some flaw to it making it non-ideal.
Like it seems as though it doesn't have an actual subscription system, but I could set a flat price for a build for example to be sold. Then I could 'increase the price' to maintain your access to the new builds for example. That would work except I would like it that if you support me during the dev cycle that it's cheaper for you than it would be when the game is released.
Anyway, I set up a Boosty. For now it will just host the builds, but if there is interest I will also host the npc polls there too when a month starts.