To the first part, having a wincest patch here would be nice for those that want it, but the most important thing for me is to play the story as you, the creator, originally intended. If you truly meant to write the story as a guy helping out family friends as stated in the OV, that's how I'd prefer to play it. For example,
Braindrop's WVM has a transgendered character, but he wrote it from the very beginning as being able to choose to have that character as a regular female if players wanted. In that case, I've no problem choosing my preference.
As for the second part, as long as you have the game on Patreon,
absolutely not. It would be a really bad idea to muck about with it while being aware of the rules there. Many big games I'm aware of that features wincest at their core has had to take many pains to make them 'Patreon acceptable' while finding a way to keep true to their vision, while others have had no apparent choice but to cave in and corrupt their story to stay on P. Others, just on their game's title alone announcing exactly what the story is going to be about, moved such a project off P altogether while keeping 'Patreon approved' projects up on the platform.
You've
just started up your very first game: it would be best not to poke the bear on this.