It's a little unclear to me what pieces you're separating. Bottom line, there has to be some severing of the lacquer. I make a very thin cut with an extremely sharp blade. I feel that an extremely thin point works best and chances are the edge will be gone after this single operation. Perhaps an Xacto #11 blade thinned ( without ruining temper ) at the just the point. In my shop this is the domain of various tool steel marking knives that I expect to have to resharpen after a single job.