They are available for my build! Not so sure I'm going to make a product out of it. Probably not a lot of folks who want to spend the money required to do this full conversion. The pump and pulley I bought from Detroit Speed were pretty expensive.
Andy, these pumps seem to be a popular add on for Gen3 guys. There may be a market for a conversion bracket, especially because it's a singular plate.
Where's what I did on my G3, it also doubles as my torque strap mount [I am not selling them/trying to hi-jack Andy's thread]. The third bracket-to-head bolt is behind the pump and countersunk. The spacing and pulley is just right so that it uses a factory 6.1L serpentine belt. The lower mounting is also a little better on the eyes, the pump is in a pretty prominent location when stock. The bottom right bolt on the bracket is 3/8-24 threaded and serves as a mounting point for a torque strap, which ties to the factory sway bar bracket on the k-frame.