I've shortened and extended a number of paddle shafts over the years, so I'm getting pretty efficient at it. It doesn't matter what type of epoxy they used, they all come off the same. All you need is a hack saw and a hammer or heavy pliers.
Start the clock.
Cut the shaft ...... 10 sec.
Cut the shaft on a spiral up to handle...... 30 sec.
Peal the shaft off the handle with a hammer claw..... 10 sec.
Sand the handle shaft..... done!