The MR2 harness and ecu locations are completely different. There is a lot of location changes in the engine bay for various components, how the AC system works, where the harness passes into the passenger compartment (trunk in the SW20), etc. The only real option you have in my opinion is reparing the 185 harness or getting another used one in decent shape.
I'd be happy to take a look at your harness if you could post pics of the "damage". I've restored a couple of 88 harnesses for people using some cut up donors I have ($400-500 or so each). I probably have a 205 harness around here from a swap too that I could use as a donor for some of the stuff on your 185.
My electronics background: 6 years of electronics assembly full time working my way through college -- everything from winding transformers to soldering ultrasound cables under a microscope.