I'm a bit in limbo with the current physical testing, as I wait for the updated pistons to be machined.
So I've revisited the CAD model of the trigger. After a couple of days running through the options it's now a bit simpler in design and 10mm shorter (length which comes directly off of the action).
All sears will now run on self lubricating bearings too, so no break in period or periodical oiling required. Sear contact area is very small, but in a very safe way (similar to old 10m match springers in a way).

Looking forward to getting some units made up now!