Now I don't know how much money your team has but I was recently turned onto a these really nifty quicklock clamp collars.
http://www.mcmaster.com/nav/enter.asp?pagenum=964 (Third item down) When you tighten them, the inside gets tighter and the outside gets larger allowing you to clamp shafts onto outer pulleys. They cost from about 30-60 dollars depending on the size. My team probably isn't going to use them this year, but in the future they're definitely going to be a go to item for all our projects.