I bet we're missing the top down part. I think this book http://www.amazon.com/Hip-Knit-Hats-...4952130&sr=8-1
does top-down hats, but they're knit in the round, using dpns, at least to begin with.
Can you just reverse the process for any 2-needle hat? Cast on X, inrease in all stitches the first row, etc. and end with your ribbed or rolled brim?