It's too bad they don't allow updating/backdating because a 2.2 swap would help you a lot, especially with your upgraded diff. I swapped out my 220K+ mile EJ18 for a much younger EJ22 and it's great.
With how strict the rules are in your class (if it were me) I'd go for a lightened flywheel. I know the cost is steep but I know first hand how much of a dog that 1.8 is and any extra performance you can squeeze out of it should be done.
I don't know enough about the FWD compatibility between Subarus to comment on your gearing question, sorry.
For bushings your choices are pretty limited. Whiteline, Group N, or Super Pro. If you're going to replace a few you might as well replace them all.
Tranny mounts are even more limited. Group N or Cusco, and I wouldn't use Cusco mounts on a rally car.
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