I'm sure that someone else has thought of this already, but I recently found a way to save some time while cutting my bareshafts while testing arrow flight. In the past I've always cut from the nock end because it was faster/easier than trying to remove the inserts.
Yesterday I went to help my brother test some different arrows for his new bow. I took a roll of teflon tape, the type used for plumbing, and gave the insert a couple of wraps and pushed it into the shaft. Held fine, and when it was time to cut I just took a pair of pliers and pulled it out. Couple more wraps of tape and put it back in. Woila! Like I said, I'm sure I'm not the first guy to come up with this, but it worked well for me.