I'm sure some of the Army Helo guys will have the most current info, but I've had two friends go thru the Warrant program, one for aviation and one for engineering, and another into aviation as an officer, and since no one else has chimed in yet I'll add what little I know ...
According to what I was told, at least 60 hours of college credit was required for the Warrant Officer aviation slot, unless it was waived, which it could be under special circumstances but I don't know what those circumstances are, I'm betting it has something to do with prior service as a crew chief er sump'n. Both friends that went thru had at least a two-year degree. So, I'm not sure a Warrant/flight slot would be available to you without at least two year degree, even in the guard. When I spoke to the guard unit (rotary-wing) at RDU in 1995 they told me the same applied to their unit for flight slots (I had that covered).
Now here's what one friend did to wind up in a flight slot, with no prior college: he first did a four-year hitch as a DAT (Dumb-ass Tanker) and completed an AS degree at night while in Fort Hood, using the Army's secondary education resources. Following ETS he finished his BS, joined ROTC while he was doing it, and then went back into the Army as a ButterBar (ouch!

) and with a school slot at Rucker (AH-64s). And one other guy: did two-years as a crew chief on OH-58s, completed an AS degree at night, and re-enlisted thru the BEAR program for a Warrant Officer flight slot and was flying a Blackhawk for the 101st.
So, as others have said, for military aviation there's really no way around getting at least a two-year degree, and you have to be aware that you're a soldier/sailor/marine/airman first, and this entails a LOT of things that aren't too cool (and some things that are WAY cool). As an old fart, allow me to be a know-it-all and tell you what I'd do if I was young again with no degree, no funds to get one, and needed a little adventure in my life ...
Talk to a recruiter and possibly a guard unit commander about a crew chief slot in Army aviation, make sure you can pass the US Army flight physical before diving in. You could do a two-year hitch as a crew chief and finish an AS/AAS degree (at night while not in the field, or long distance if deployed) while you're doing it. There are tremendous number of educational resources in the Army, most geared towards soldiers' hectic schedules. As long as you had the two-year degree (or would have it by ETS), had a good record, and could pass the flight physical, your retention NCO would probably be glad to help you get a packet together to apply to Warrant officer/flight school for your second hitch. By then you'd know whether or not you were cut out for the Army and wanted to commit four more years to it as a helo pilot (since you'd served two already, I think you'd be eligible for a four-year second commitment instead of six-year).
With luck and hard work, you could serve your country for six years and ETS with a four-year degree, a couple helo types, a few hundred turbine-multi hours, and the knowledge that you'd done your part (priceless IMHO). You could transfer to a guard unit and start looking for work to build fixed-wing multi time. You'd be golden.
Best of luck with whatever you decide, and let me know if I can help.
Minh