The synchros look like they’re brass, at least in colour, they could be some sort of alloy but really I don’t know.
I do know that the early (and any phase 1 gearbox with other mods) EJ AWD drive gears fit in the EA82 front cases - BUT - and this is the catch for you in the states - the EJ internals MUST be the same spec as the EA82 front cases they’re destined to be fitted to. This means the dual range RX AWD box can use DUAL RANGE EJ drive gears. Just use your pinion shaft, EA centre diff and rear housing.
The trick for you here is finding a phase 1 EJ dual range gearbox…
I’d suspect that many parts of the Gen 1 series 1 EJ gearbox are the same as the EA82 gearbox but really can’t be sure.
Good luck swapping in WRX subframes, not an easy task if it can actually be done in a non-lifted EA body. The track would be heaps wider and would probably look odd too.
Suspension bushes - there’s always an alternative out there, you just need to know what you’re looking for or know a good parts interpreter that’s willing to hunt around for you. Aftermarket will be the go here. Superpro or Nolthane would be my guess for possibilities.
Struts - talk to a suspension mob and see if the can do an insert replacement or make struts that will accept an insert that’s easily available. Or convert to EJ brakes and have all the EJ strut options at your fingertips Good thing with this is you get better brakes and better rim options too.
It all depends on how far you’re willing to go to keep the original drivetrain and look of the vehicle alive. There’s always some sort of a work around!
If you go the WRX drive train you can keep the locking AWD with some gearbox mods. Basically you replace the ring, pinion, centre diff and matching rear housing into the EJ gearbox you want to use. It doesn’t matter if the gearbox is dual range or not for this, but you are stuck with the (most likely 3.7) diff ratio your box has now unless you do a cut and shut on the pinion shaft to your desired diff ratio…
^ this gearbox mod allows you to run the EJ standard flywheel and clutch setup with your EJ engine of choice while retaining your RX factory gearbox crossmember, shifter linkages and prop/tail shaft.
Cheers
Bennie