If you are talking about to sell in the C-Store orions and Gorns to FED by a high price and in exchange the Crypt make more cool stuff to KDF, ok go on!
But no. KDF and FED are in war. True Way, Remans, Icon-something, Throllians and any other kind of enemy is not enought to make KDF and FED work well.
Borgs is a plague, but is too strong to make the Honor Guard and Omega Force in each faction work in a team. But aside the Borg problem, FED and KDF have to be enemies, because each one have your own cultural and political ideas, and don't work well under the same roof.
The KDF and feds are at war, albeit a slow unfleshed out war, due to Undine subversion and the KDFs recent reacquisistion of old systems once held by the RSE. Its an old story of divide and conquer and one we are in at the moment.
I don't see why a KDF/FED player cant join whatever player fleet they want to. Player Fleets tend to act almost independently of Political boundaries anyway and could make for some interesting play and the Gorn according to canon were a member of the Federation (pregame)....i/m/h/o.
Id like this to happen, but the very minimum should be cross faction teaming. And no, I am not talking about private and pve queues, I mean a simple right click and add to team like you can do with other fed players or if you are kdf, other kdf players...