I don't know of a Mod but, would relationship cheats help? You can find them here: https://simsvip.com/sims-4-cheats-codes/#Relationships
the instructions are a little outdated because it says to enter the cheat individually for each of the Sims in the relationship. There has been a game update since this was written and now you only have to enter the cheat for one Sim in the relationship and it will update both.
Also, if you use the cheats, even though the friendship and romance bars indicate a relationship you will still have to do things like introduce your Sims and have "first kiss" and other first interactions.
(Sorry I didn't answer before, I was really hoping someone knew of a Mod for you!)
