I took to finding some parts myself. I ordered a reduced spring striker spring kit from wolf, along with some different connectors (zev, ghost, etc.) you're right in that swapping parts is fairly easy and quick - so testing different recipes is easy enough. I don't really have a problem with take-up and over travel, but for $20 it might well be worth it to get a adj. trigger bar and see how it is.
Sorry to hear about the disc - those are no joke and if you need surgery it must really be severe. I hope all goes well and you can get back to tinkering asap.