Hello to all, I find this thread and I want to write my experience. I have a 2016 GT-S 1.6L WITHOUT Eyesight in Italy. With a mechanic near me we do the MT Swap. He find a full WRX STI 2018 Transmission (Gearbox, Axles, Rear Diff, Transmission Shaft), and I find the pedals and the center console. For the mechanical part is plug and play but for the WRX STI driveshaft we had to do a 30mm plate to fit.
For the electronic parts he did a relays box that do the AT Shift, when I pull the E-Brake the car goes in P, when I remove the E-Brake the car goes in D.
I drive the car for 3000Km after the swap and It's totally different from the CVT.
The only cons is the 1.6L because we can't do much HP (200HP max) because the small turbo and the delicate bushings of the engine.
You can find some photos on the attached link
Manual Swap Photos