Take a piece of plywood 4 inches larger than the pulley and as thick as you can get into the pulley.. Cut a U shape into it that matches the inside diameter of the pulley. When you slide this into the pulley you should have about 2" of exposed wood most of the way around it. With 4 bolts, bolt a rectangular piece of that plywood to fill in the gap where the U is so the pulley is completely surrounded by wood. This will keep the wood from flexing too much. Attach a gear puller to the wood, not on the bolted side. You should be able to pull it off the shaft like this without hurting the pulley. I used this type of set up for years on GE washing machines 60's - mid 90's with the clutch attached to the motor shaft. I didn't describe it very well but I hope you get the idea.