To substitute for the 16 inch (which I'm guessing you use for the sleeves?), you could knit on two circulars (with needles the same size) and buy an extra set of the KnitMate tips since they are relatively cheap, I think like about 3.00 a pair. Check out the video under Advanced Techniques to see how that's done. Magic Loop would be another option.
You could probably get away with using the 29 inch instead of the 32. It's easier to "smoosh" stuff together than try to stretch it out over a longer needle.