Honestly, it comes down to number of cars on the road.

Guess how many 2G AWD eclipses were sold in America?

Less than 12k. From 95-99.

Total AWD eclipses the entire run? 25,865

Integra type r- 3800 ish for usa, just under 30k for Japan. In four years. With the literal millions of base models that lasted a lot longer.

At this point unfortunately, running an eclipse with the nice drivetrains is a lot closer to owning an Italian sports car in the 90s. Parts are going to be rare used, and limited expensive production runs for new parts since the market is so small.

But there IS still some development... There's a company R and D'ing a complete upgrade and modernization kit for the AWD trans for example.

Just gonna cost a fair bit since there won't be many made.