I'd imagine in a car like this the swap would be unbelievably hard. With all the electronics, sensors, modules, etc. that probably have to do with the transmission and shifter, it would be a painstaking amount of work.
Gone are the days where you can take a transmission from a Ford Escort, Kia Sephia, or Mazda 323/Protege and the accompanying linkages, pedal assemblies, and shifters and they all interchange perfectly (same engine, basically) with nothing but a change in hardware being needed.
I'd say if you want a manual, trade-in for a manual and cut your losses if it's such a big deal.
Otherwise, enjoy the car as it is and when the ST comes out, then think about swapping!