Some 1966 VBs support adding a PTK. I think you can it to all 1967+ VBs. I reworked the VB in the original 727 in my Windsor to add a TransGo TF2 kit and do another mod recommended by "Torqueflite Patty", I also added one of what you called the "complex" PTK module at the same time. Between the VB mods and switching the rear gears from 2.76 to 3.23, that really woke it up! My car felt like it was always in the power band.
The other mod that was recommended to me was to partly fill a particular cavity inside the VB with JB-Weld. Apparently there is high pressure in one section of the VB, especially if you install a kit and turn the pressure up, which can crack and start leaking. A layer of JB-Weld in the floor of that cavity is a preventative measure to strengthen it.