I think you have to explain that a little more precise.
1) What's the point of creating a new account on Patreon and doing the same "forbidden things" there? I guess you mean a completely empty fake account and post the website link there. But how would my patrons know about this fake site? Only if I tell them. And if I tell them on my original site then I might as well just give them the download link for the uncensored version and this is exactly what Patreon doesn't allow! Cause even if I just tell them to go to the fake account for the link, it's the same thing in the end!
2) And what people shall I ask to post the link? Where would they post them? How would my patrons know about that? Even if other people would tell them, sooner than later Patreon will find out!
3) I thought about maybe just sending the information of how to get the uncensored version, via message to all patrons. I don't know if Patreon reads such messages though.
I'm not sure how it works really, I don't support any incest developer, except you.
But I imagine you spread the patch/incest version by simple comments on your posts. And you're not the one making the comments. Worst case scenario Patreon can ask you to moderate the posts, but it's not like you can stay 24/7 to delete those "bad guys". Or they go after the accounts commenting with the incest links, by I guess they don't care enough to do that.
For the comments you make a simple user account of course, not another creator's account. To comment on your patrons only posts you'll have to have a valid payment method for that account (a PayPal account, or a credit card) so you can pledge to your campaign.
Or you just find one of your patrons to do it for you. You communicate with that user externally, of course, Patreon can read your messages.
This whole system is based on pretending that someone else makes this incest mod and spreads it for your patrons right there in the comment section of your posts. Changing some text lines in a Ren'Py game is rather simple. Patreon surely knows what is happening, but the author can always say it's not him that does it and it is a possibility.
I'm not sure how this will work with an entirely different version of your game though. You'll have full scenes with this incest stuff, not just changed dialogues. The Patreon staff must be extremely stupid, or not give a shit, to believe that some random modder makes the exact same renders as yours and takes the effort to create those entire new scenes.