Looks great!
For the second switch, call me cheap n easy, but I Just tapped all the second switch wiring right onto the first switch wiring. Basically the first FJ harness now becomes the DAC harness for the second FJ harness (if that isn't too confusing

).
It made for a bit of a rats nest...but I don't see it and it kept both FJ switches on the same power/ground sources which I think will make easier to troubleshoot.
I'd wire to whichever you want and/or think is easier. I will say you won't blow any fuses or burn anything up by using the same DAC wires (that's essentially what you're doing if you just tap into the existing FJ harness wires, and I find that easier since the existing FJ switch/harness is closer than the DAC switch/harness to the new FJ switch/harness, especially if you left a bunch of extra wire on the first FJ harness).