While I have not cerakoted a barrel, I have ceraokted several other CF parts for customers (motorcycle and drone parts.) I prep the surface just like any other cerakote job, except at a lower psi in the blasting cab and will pull the gun away from the part a little farther. You're just needing to lightly scuff the surface. You can also scuff it with a scotch brite pad. But, I don't like the finish as much using a scotch pad. As far as heat, any material that will withstand 150F can be cerakoted. Heck, I've even cerakoted a pair of shoes once. I bake CF parts at 150F for 3hrs, then shut the oven off and pull the parts the next day. I don't know if letting them cool slowly over night makes a difference or not. But, I've never had any issues.
Edit: Also, I degrease CF parts with Simple Green, not acetone. Not sure if acetone would do anything to the CF, but I never wanted to screw up a customers parts trying it.