Personally, i think the blade trig that AKA sells is not worth the money, I have trouble walking the trigger with it.
If any machinests want to try their hand at making a new trigger, here is a picture of pretty much what i think it should be:
(Notice the more vertical angle? This is better for walking the trigger
It's half viking/excal trig half cobra stick, and IMO will be the best solution to easily attaining high rate of fire. I'm sending my spare stick to my buddy to have him create one of these (I don't have the tools to measure and properly draw out the plans for such a trigger..