looking at the files the mod uses, nothing flags me immediately as being an issue. But since the idea for this mod has expanded to involve quests taking place on multiple worlds, there's potential for a conflict that can be addressed if/when they arise. Without having all the quests fully fleshed out it's hard to say atm. But definitely something to keep on the radar. I've never used Recruitable Kay to date.
So far, the only module the sublevel changes beyond its own is adding the necessary components to allow entry from danm14 and return to such from the Sublevel. This will change once quests are fully integrated of course.
If you think of anything as being a potential conflict, just let me know!