#1
If I was to have a stereo delay and a stereo reverb and run the wet signals to an ABY box, could I Y those signals into a harmonizer/pitch shifter and then run that mono signal to an ABY box with the dry signal and make it go back to a mono signal to go straight to my amp?

Sounds confusing, I know.
#2
Er...what were you hoping that would do for you?
It wouldn't really do anything different than running them in mono the way I'm understanding it.
#3
Keep the original signal the way it is, but be able to have harmonies in my delayed repeats and reverbs.
#4
Oh, I see now. Yes, I suppose that would be possible. Might sound strange, but it would work.
#6
Actually, you'd need a different setup. What you'd need to do is get a Y cable and run the wet output from both reverb and delay into the input of the harmonizer. From there you'd need to run that output into an A/B/Y with the dry outputs of those pedals (they could be in series) and then to the amp.

Whew!