One of the common complaints about the bullpup-configuration rifle is the lousy trigger that almost always results from the long linkage between trigger and sear.
Why not make it a single set trigger? Add a sprung hammer or striker above the trigger. When the trigger is pulled, the hammer/striker strikes the trigger linkage, with force independent of trigger pull weight, and lets off the sear. Reset the second hammer/striker on recoil somehow.
You add 3+ parts to the overall package (depending on configuration of parent rifle), but the trigger is much more configurable for the end user. There would be a tiny amount added to lock time, but hardly enough to affect accuracy for 99% of shooters.
I realize the bullpup is considered sub-optimal by many, but since so many militaries out there issuing AUGs, L85s, Tavors, etc. I wouldn't be surprised if someone out there already tried it.