I'm telling you the piggy back tuners are what guys use in cases like this. I have personally used several from Perfect Power. They will do everything we do here with GM stuff. They also work with all the GM ECMs instead of doing the chips. They also have capabilities for tuning nitrous, turbo and superchargers. Once you find out how much they cost and the ease of installation and use compared to re-inventing the wheel you will believe me.

But if anyone would know if your Jeep ECM could be done would be Westers Garage.
http://westersgarage.eidnet.org/index2.html

As far as someone to hire to disassemble a chip, write an XDF and ADX look for Traxion or Cal Editor on:
http://www.monodax.com/forums/forums.php