There used to be a short rack for our cars for about $400, but I doubt you would find them anymore. I had wondered if you could get the steering gear from a euro 205 to change the ratio in a 185. Some other racks are compatible with our systems. Gtfour77 used a corolla rack I believe. It might be worth looking into a 7th gen celica rack to see if they improved it, and if it might fit. There is also a steering gear for a sw20 that might be compatible in our system, but of course you need to get a hold of a mr2 system and compare them. There is a good chance it would not work at all.
I have a really small steering wheel and it does work to give me some quicker steering, though it looks like it belongs in a gokart.