I'm pleased to hear from someone who's trying CP. Your motive seems to be one of the best – put a predator in the pond that will provide action when the others (LMB in your case) won't. And diversity is always nice when it comes to a pond.

From all I've read, LMB will eventually eliminate CP if conditions are right for both of them. But maybe that's not necessarily true. I would think, and hope, that you can control the ratio to suite your wishes through fishing. At any rate, I hope you will continue to keep us posted on how this goes over time.