I know you asked John, but he does not use PSX-ACs nor does he have a ZW-L (at least I don't think he has one). John uses PM180s, which has a very fast CB as mentioned many times.
The second bullet is what the PSX was designed for. Find a cheap CB for the accessories.
I don't have a ZW-L either. I have asked in the past what ZW-L owners think of its circuit protection, but have not really received an answer. If it is as good as the PH180 then you probably don't need a PSX.
Make sure you add TVS diodes.