My experience with talking with C12 guys in the guard is that it is a good ole boys club to an extent. (I want that job, too!) Most if not all of the aviators were rotor guys first, paid their dues for years, then went fixed wing. Also, the units are small, and when people make that job they tend to keep it until retirement.
Being an O-3, that may be of some advantage, though. In the active Army, they need branch officers for PL's and Company Commanders. But, in the same token, you might find a unit that has a Warrant slot open and you could take that if you don't mind downgrading your rank.
You say your branch is Armor. Never been an aviator? You would need to go through flight school and get your wings before they would send you to fixed wing school. So, I guess you would be rotor qualified anyway.
With your qualifications, I say the best thing to do is research the C12 units around the country and call them. Call the State Aviation Officer (SAO). Perhaps they have an exception to policy that would allow you to come in and go right to fixed wing school, although I have never heard of anyone not having to go to Army flight school first. Can't hurt to ask.
Also, you eyes. Current regs say that for initial entry aviators, you need to have no worse than 20/50 correctable to 20/20. There is a laser option available. You have to pay for it yourself, but then you get evaluated by USAARL for 12 months before you go to flight school. The part that stinks is that after you get your wings, you eyes can go to sh!t and still fly as long as they are correctable.
Best of luck.