That is an intriguing question. Perhaps a short throw mechanism from some other tranny will fit the MUA5, but I suspect no one has tried.

To answer the question will be either $$$$ or time consuming or both, unless you get real lucky and one of your early investigations works.

I doubt that many, if any one shop will have more than one model in stock, if they even have that. Since we now know that there is an option available for a T5, you could start by finding a junkyard 2WD Rodeo with the T5 and buy the shifter. Once you have that in hand, you can compare it to the shifter in your own rig and see what the similarities or differences are.