You know, now that I think about it, I think I'd go ahead with the 2x2 rib, but basically use the original decrease instructions. Since you're decreasing (or increasing) evenly on each side, you'll still keep the look of the pattern. So on your first decrease, you'll do an SSK/K2tog combination, but when you do your second set of decreases, you'll do an SSP/P2tog combo. I think that's right, based on how I'm visualizing it. I am on Vicodin, though, so I hope I'm making sense!
*Dream Swatch in Madil Eden Bamboo
On the needles:
*Isabella from Spring Knitty
*Striped hoodie from Nursery Knits
*Tomato from Knitting Daily
I'm hunterjenn on Ravelry. Come find me!