[Raptor]

The boroscope can be done before the belt. The engine doesn't need to be turned over for that, it is just visual inspection. If that shows there is no significant damage or indication of valve to piston impact, redo the timing belt then do the compression test to verify things are in order. If however there is valve to piston impact, it will show up with the boroscope test and I would pull the head at that point and check the valves to make sure they are seating properly and not bent.