These folks could answer the question if I wanted to pay for the answer:

Quote
As described above, the percentage of power required to satisfy the pumping requirements of an automatic transmission can be as high as 20% of the overall.


Southwest Research Institute

My guess is that the answer would be expensive.

Frank

'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum