Quick update:
Q1 seems answered: Plug the Kinki EX-M1+ into a regen socket.
Q2 also seems answered: Paul mentions here that SMPS should be plugged into the Powerplant if it is part of the audio chain. Another user mentioned good results with SMPS into the Powerplant.
Q3: Two friends in SA who have both owned Powerplants advised me that additional power conditioning is not required upstream or downstream.
My P3 arrives tomorrow. So it seems I’m good to go. Looking forward to this next leg of my audio journey with a Powerplant in my chain.