I still think our best option at arch villian should be a version of yourself.
1) Mirror force version of you, similar in every way, skills, traits etc.
2) A Borg version of you guessed it, yourself. Retaining human/klingon traits but serving the collective.
For both of these, im not going to claim to know anything about coding but. Couldnt you just use a code that instead of showing a pre-made character, uses a code to pull your captains image out of the server o.O. Then some code to alter costume designs to go over yours. Like borg implants or mirror force uniform.