Prior to the Delta Recruitment event I had four chars (Fed Sci, KDF Eng, Rom/Fed Tac, Rom/KDF Tac). So, like OP, my first Delta Recruit is a (Liberated Borg) Fed Eng based on the Fed Sci's Liberated Borg Chief Engineer BOFF.
I haven't made the models fully match yet; I still need to take screenshots of the head and body sliders.
But yeah, if there was an in-game mechanic to simplify the process, that would be awesome!