I would make the change and lay it off again. For one thing you will have a complete program that you can store as a part of your NLE system. Start the process and go to lunch. A long lunch.
Another workaround is a simple one if you have two Tape decks. Lay the segment you want on another tape. Then use the linear editor built into the Tape machine to edit the scene into your existing segment. Should work flawlessly although it is an admittedly inelegant solution. Should only take a few minutes.
FCP 7
MAC 8 core
BlackMagic Studio Pro
After Effects
PhotoShop
Illustrator
Lots of other Fun Stuff!