What type of kegerator is it? Is it home made or manufactured? If it's manufactured, the tap should have a silver collar on the outside of the tower. The faucet should just unscrew from the collar. Can you tell what type of faucet it is? Once you get the faucet off, whatever you do, don't force it to operate. Soak it in a mild soap/hot water solution and gently operate it until it becomes free.
The mod from Sanke to Corny is easy. Since you're replacing all of the hoses anyway, Just cut the tubing far enough from the metal fittings so that you can connect with hose barbs and keep the Sanke tap in case you want to use it for BMC for a party or something. Luck - Dwain