They'd be crossing a bridge the Russians didn't in their design process (though I doubt the Russians ever thought too hard about making the Kh-35 a submarine-launched system, to say nothing of trying to make it work). I'm sure the NorKs will spend an exhorbitant amount of effort trying to make it work, but in a real sense, neither the current North Korean submarines capable of using them (eg the ROMEOs and most likely the new submarines) nor their tactics really benefit from them having AShMs. Though I read somewhere on speculation that they would try to equip some of their submarines with SLBMs, which is probably far more useful to them overall than AShMs. I won't speculate on their ability to successfully deploy those (especially in the C2 realm, which I imagine must be interesting for the DPRK especially), but that seems to be a goal.They have Kh-35 missiles in their inventory. Is it possible they could adapt those for launch from subs?
Now, setting the Kh-35 up to be used as CDCM? That would work, since they have the coastal surveillance systems to be able to make that work, and it'd be a major upgrade (to put it mildly) over their current STYX-based systems.