I'm running 10-speed Record (c. 2008) on my spare bike. It currently has a compact crank on it (50-34), and I want to run a wider (12-28) cassette. (Going on a mountain trip, and need some climbing gears.) The current short cage Record derailleur can't handle the range. So, I think I need a medium cage for it. I'm loathe to spend ~$400 on a new Record rear derailleur for it. Any sense of whether some of the newer, 10-speed Campagnolo medium cage rear derailleurs will be compatible, e.g., Centaur, Veloce? Thanks in advance for your help/advice!