@ Chocolate_preztel hi love,
thank you so much for the request! I love this idea, I was thinking about something alike lately and it's quite similar to what's about to happen on my current work.
Unfortunately, right now I'm focused on my current fanfiction, so I don't think I have enough time to start writing a new one in the upcoming time. However, my fic (once it finally reaches the main storyline, meaning the originals) is going to be quite similar. It's very much centred around Elijah and his crisis, that's what's alike your request. However, as for the oc thing, well the oc here is obvi his child, but he does get a better pairing than in the show (sorry not sorry, not a haylijah fan). I thought about it for long, but I finally decided that the healthiest among his loves, was Gia in to s2, exactly because she's emotionally intelligent and brought him a sense of peace and understood him.
So unfortunately for the next few weeks (definitely until holidays, don't know if what later), I don't want to start another work when I haven't finished the ongoing one. The good thing is, your request is similar to the main storyline of my book, but it will take me a few more chapters to get to to chronological. Once I'm near the end of this fic, I'd love to start the story you propose though.