I have always wanted one also, found one last year for $50.00 on ebay so I bought it..Very light wieght, Works good for spring riding and something to wear before you put on all your expensive stuff...It sounds like it would work perfect for your needs..
I wore one all last year and would recommend it. I hate overheating so even on cold days I just wore it and a couple thermals. The only thing I didn't like was that the logo was printed on and not sewn. I wanted a Klim Inversion jacket but didn't have the cash. If you buy HMK there's a guy named Snowday on here that's great to deal with.
I have an HMK tech hoody (zip up) and they are awesome! If it's a known clear day even quite cold winter time it's what I wear. Works great over body armor and offers excellent freedom of movement and wards off the snow if you get flung off. Sporty goin out wear as well (beer spills roll right off )! The HMK logo on the 08-09 stuff is stitched in gray or pink. I think about $100 and well worth it. GET ONE