I hesitate to add my three cents to this discussion, but it appears that you want to run your layout with the handhelds. You therefore don't seem to be interested in running from turnout to turnout flipping them one way or the other. I did not see in your mix of equipment any ASC's or ASC2's. With these units you can flip your turnouts any way you want from your handheld. And if you go that far you may want some BPC's (not to be confused with the newer BPC2's, they are not the same). The BPC's can turn power to track blocks off or switch the CABs (each control handle) of which you are thinking of Two. I have one CAB setup for conventional service and the other CAB for TMCC/Legacy operation. Doing this is somewhat (it always seems) confusing for the first time layout builder.
This is my control board. The rectangular boxes toward the front (5 of them) are my BPC's. They route the power from my "Z" and "ZW" through my TPC's (the silver boxes, your control handle 1 and control handle 2 in essence) to my various Blocks. The ten rectangular boxes in the back are my ASC's and one (1) ASC2. And of course the two Black boxes to the right are my TMCC and LEGACY controllers.
