Well my brief opinion over breakfast...
I'm not sure I fully understand what you mean by CP in this context, I suspect that you actually mean CG aft of the aft CG limit?
As a situation, what you describe seems feasible, the subsequent actions are very dependent upon aircraft design.
For example, if you've got a type with a very high thrustline, then power will probably help - alternatively with a very low thrustline then cutting the power will help - this is just all about moments about the vertical CG.
Wash over the tailplane is a less clear issue - but lets say you have got a lot of propwash over the tailplane. In that case, increased power should make the tailplane ,more effective and may aid the pilot in getting the nose down.
Flaps - not sure, I've seen flaps both stabilise and destabilise an aeroplane in pitch (both high-wing / low tail aeroplanes). I'm sure there's some theory out there which describes what SHOULD happen, but my experience it's never as simple as theory would have you believe for which reason I'll pass on that one.
G