I kind of do that now and plan to.

On my KDF side My Main is a Tac Captain, his minion is the science alt. The have all the same BO (minus one or 2). The main also has a BO of the Sci Captain. Since they are both "alien males" I can swap their looks and even the alien soildier-type as a costume.

Once we can change our captain's race and gender, I plan to make my Tac alt (which is now the same as my Eng main) to be like my current First Officer. The Sci alt I might remake into my CMO, if we can ever get Deferti or more alien parts