From what I see, your way of seeing the game totally collides with my way of playing it.
I never see more than one ending (I see one or none). Of course I'm not going to ask you to modify anything in the game (except for consistency with the previous choices, which you have already indicated that you will do, but that is something reasonable). However, that doesn't prevent me from feeling frustrated and preferring not to see an ending. Losing that scene almost completely kills my interest: if I play the sabrina route to get it, then I'm not going to play the harem ending (and I certainly prefer the harem ending to sabrina's), and without that scene I don't feel like playing the harem ending. If the Sabrina's ending only included her, I would still pass the harem ending and play it, but how also Miracle is included in that ending I don't have much interest in play it (to say nothing).
Well, whether or not Paris is pregnant isn't something that matters much to me (in fact it is only for consistency with my previous choices) Personally, I followed the pregnancy route because it seemed that it was the one that Paris was most excited about. If Paris isn't pregnant on the harem route, it doesn't bother me (except for coherence with previous elections, but since you have already said that you are going to solve it, then I don't see any more problem in this regard)
What really frustrates me is what has already been said about Sabrina. I don't know if there is something else that I can dislike, because I have stayed at the beginning. I haven't even got to know if Paris is pregnant or not (in fact, if it weren't for the fact that they said no, I would take it for granted, due to my choices, that she is)
I cannot comment on the ending beyond what I have already said (I haven't seen enough to be able to give an opinion as to whether it is well developed or not)
For my part, I don't think I will play the DLC. Without seeing an ending, I don't think I feel interested in playing it.