My friend, do you think there aren't a ton of musicians out there who would kill to get a good producer? Guitarists who struggle to write drum parts? Skilled players who struggle to write anything decent? It totally depends on who happens to be around, but there's a world of possibility out there for someone who loves production and is decent enough at it!

Yeah, it would be better if you could jam, but it's not needed. Besides, if you use a midi controller, it's a small step to keyboard, and getting better st playing will help your writing (and make it more fun, imo).

I can't guarantee it'll work out, but I also can't stress enough that, based on what you have said, you've got a good shot.