I'll be using a T-leg 4EAT behind the EG33 in the race car I'm working on......
Only EJ turbos had a pull-style, and are all hydraulic. And they have very different clutch fork/pivots. Although I have now seen a pull-style clutch fork with a cable attached to it....so there's always that. Likely pretty hard pedal effort, but likely still might be better than swapping to a EJ pedals.
I'd rock a late '90s EJ 5MT. Not terribly expensive, reasonably strong (if you don't drive it like a jackass, it'll hold up quite a while), push style clutch, VLSD center, common in 4.111 gears.
IIRC, newer WRXs went back to a push-style clutch, so there are OEM (or equivalent) options that would hold up.
Axles will still work. Front half of the driveshaft will have to be shortened a couple inches. Shift linkage would be best to be modified a bit (although I didn't in my '88 XT6, it was at a goofy angle, but it worked). No adapter plate. Probably regear the rear end. If your XT6 has a 5MT, you'll just need a Legacy center transmission crossmember and it'll all bolt right in.