Hux and Threepio would get along well. They just would.
They’d hate each other at first because politics, but then realize they have a lot in common and see eye to eye on so many things that Hux would invite him over for tea and they would just talk about their life philosophies and casually roast Kylo Ren whenever he came up in their discussion.
Can you imagine how jealous Kylo would be when he found out that Hux had befriended the droid his grandfather built?
Hux would be very interested in all the calculations and advise he has to say, and put it into consideration and Threepio would be like… wait youre listening to me?
THREEPIO: Master Hux, you’re – you’re listening to me? [pauses as it sinks in] You are! You’re listening to me! Someone is actually listening to me!
[Closeup on Threepio’s face. A triumphant rendition of the Star Wars main theme begins to play.]
And thus the First Order gained the allegiance of what would become its most devastating spy.