#1
would an emg-81 in the bridge pos. and a blackout EMTY in the neck pos. work? sound-wise and also in terms of wiring them up
#2
Sound wise I'm not sure, I've never used a Blackout EMTY. Wiring wise, yes they'll work.

If you have anymore questions about active pickups read through this thread.
https://www.ultimate-guitar.com/forum/showthread.php?t=1254306

If you still have questions after that, post them in that thread.