Hmm, I can see what you mean for the number 2, but that is honestly something that may create more of a mess for Zorlun, so he is the only one who can decide whether to try doing it or not.
He would need to put in the dialogues some tag that is invisible to the unpatched player, or some tag around it that does not throw a compilation error when renpy compiles the text, but also does not have any visible effect, otherwise the unpatched players will complain, correctly, that they get crap text while playing.
For the bestiality, Zorlun has already found a working way so does not need the approach we are talking about.
And let's not forget not everybody is interested in keeping the incest.
Plus, not everybody is interested in having the bestiality and the incest, even only as possibility (I am, but I am not everybody else).
Those people who are not interested in that content would not apply the patch for incest, only for bestiality, or none at all, and they must be able to play the game without seeing some strange "tag_text normal test tag_text" (or some other effect of the tagging for replacement) appearing on the screen.
Zorlun would also need to tell the patch author what should be the text to put instead.
Even then, it is not guaranteed that we will not end up with some divergence in the story - Zorlun is doing his best, but at a certain point he may have to make paths that go in a way in which it is not only a change of text, but really e.g. images would be different if there was the incest path or not, plus having to keep track of two different version of the text.
I hope Zorlun does not get upset for this reveal, but to avoid the risk of getting in a spiral of theory.
I have done the changes needed to the text almost as soon as I got the new version (and I am a sponsor, though stuck on Patreon), so well before I started exchanging messages about the subject.
So, I know pretty well what that implied for the game so far (but not for the future).
Zorlun said that till when one "plays" (i.e. modifies the files) on their computer and it stays on their computer he does not mind if one wants to do it.
Not sharing, sharing would be like creating a parallel game but using Zorlun's content, very wrong.
But of course if in doing that they break something, they cannot expect Zorlun to be able to help them .