Actually, the bars on etsy will work well for our hair. They are made with the same ingredients (although some use 'cones in them--I don't know how many don't).
Cationics absolutely have a pH (in solution) and one needs to formulate to the correct pH of hair. Some conditioners (liquid) don't have pH adjusters so I'm assuming they are in the correct pH range.
It's very possible to adjust the pH of conditioner bars. You have to know what you are doing and know how much to add.