Don't worry, the 'ludes do have hydro transaxles.
For a good, straight answer on what this swap takes, you should ask someone who has done it; not very many people have first hand experience. Here is a mini-site of a real-life H22 DA:
http://www.lr-racing.com/integra.htm
Try asking those guys what they did for a hydro conversion.
BTW, what are you doing for mounts? Do you have a custom shop that will fab them?
Edited to add:
I have the h22 g2 and i made a converter for my car. the cable is still used to pull the hydraulic cylinder. It works quite well. You can call me at my shop for more info if you like or chek out the web site
www.lr-racing.com Phone # 1(604)552-1426 in B.C. Canada. Hope i can help.
TOmmy
a posting on another board which shall be anonymously known as "g2ic.com"
Supposedly Place Racing makes a cable-hydro conversion kit that will also work.