[IPSteeler]

WOW that seem's like a cool cop. He deserves a donut!
I can under stand what you are saying about everything in the install.
Doesnt sound to hard it just seems like you have to go on many part's search's!
The only thing i can think of right now for the fuel problem is running a separate electric throttle switch under the existing pedal kind of like a bigrig.
Run a 12V feed to the fly-by-wire and from there running it to the fuel pump.
You should be able to use resistor's to adjust the voltage and amperage to the fuel pump.
That way the more you hit the gas the more pressure there will be in the fuel system.
Other than that doesnt a XJ with the 4.0 use a return on the regulator. If so maybe, Just maybe it might work with the wrangler format. You will just have to run a return to the tank and put a steady flow fuel pump in the tank if you cant just run a 12V source to the existing pump to make it constant flow.