OP here: I'm pretty flexible on the nature of the 'force related nonsense', I was just throwing it out there as a potential justification that Kylo could use for having been a dick to his partner

("You don't understand, I thought that sharing in more physical energies with other beings would help to strengthen my connection with the force, that it would help me wield it better, and it would be for the good of what we've been working towards... but now you're looking at me like I just stabbed you in the chest, and saying it out loud it just sounds... foolish..."),

but honestly whatever you want to do with it or not do with it is fine by me, it's very much an optional thing. I'm also cool with whoever you want the third party to be, canon or OC