There are plenty of alternatives to Patreon! I don't know why you keep insisting that there isn't. And setting up his own site could take less than a day to do using CCBill as payment processor. Rent Webspace, Throw Wordpress and a Forum software on it and set up CCBill to make subscription access. Hell if he needs a consultant about how to do this he can easily go to his nearest stripclub and ask any of the dancers how to set up a fast and easy porn site!
As for getting around Patreon's rules...I know of two games (both incest based) that had their page taken down for review and then made a few changes to have them restored.
MotH (a Unity Game as well!) has simply changed the relationships of the characters to be landlord and roomates in the game and you can restore their Family ties by downloading and placing a Mappings.xml file (found here on THIS F95 site.) and placing it in the Root folder of the game.
As it stands Patreon issue aside, DS himself has to decide if he really wants to keep developing this game to completion.
I'm sure he had a lot more story planned to keep the money flowing until his next game is ready for a release. And without that Patreon Money to pay the bills may not be able to dedicate the time needed to keep up with the Monthly release schedule. And unless he is willing to do what MotH did (which will also lose some subs due to the fact he can't tell them to come here to get the Incest Patch on Patreon) he is going to lose that Patreon money anyway.
I think he is far enough along and made a nice bundle of money that he should just finish the game and story to make it a completed work. Maybe that takes 3 or 4 months to complete the dangling plot lines and character arcs but once he has sewed it all up he should just find a site (or make his own) that will let him sell the game as completed work for $40. If he wants he could build a Patching system and update the game when the mood to add content strikes him and make that Patch a Subscription service just as all the Online games do when they add content.
So it comes down to...
- Does he want to do the work needed to make the story Patreon safe but easily can be modded back to the Original Incest
- Put in the effort to make his own site with CCBill.
- Complete the game, call it a business success and sell it as a completed work.
- Abandon it and move on to Glamour and hope it sells as well as this one did.
1-3 may seem like a lot of work but then again keeping that Money flowing should be worth the effort.
If it isn't then what we will get is #4.