Join the Blackbirds perhaps? He also seems more psychopathic rather than sociopathic to me. I recall seeing one or two other HK models as PCs but I don't think I've ever seen an official tech submission for an HK.
Yeah. the droid will have to be approved even as a character-basis. Keep in mind that the droid is probably too advanced for the timeline, the droid's durability is held up to armor standards as well