Yeah, I recall there's mods like Kerbal Wind and Kerbal Weather Project, tho it seems like both only apply to Kerbin. The former seems to have a more randomized wind direction/speed and the latter has what amounts to a (very impressive, btw) climate simulation. I feel like what I want falls somewhere in between those two: something where wind patterns can be clearly and distinctly defined for any atmospheric body, while being more approachable than effectively simulating that body's climate.
I'm scoping out what kinds of features I want in this plugin. Someone I talked with on discord suggested being able to use flowmaps to define prevailing winds, which I will definitely look into. If you (or anyone else reading this thread) have suggestions of your own, I'd like to hear them. :3