Well, basically the title said it!
Back in the days when I played KOTOR 2 I was impressed with HK-50 droids. Their gloomy tone with professional but sociopathic and sadistic nature was a very interesting combination for a droid character. And not like HK-47, who I consider now more as a comic relief, but a real assassination droid. Fighting them were hard and each encounter was unique. So as I'm saying I think it would be a great idea to ad their customization for HK droid in SWTOR. Usually I run with HK-51 cause he is great and the closest thing to HK-50 character. But personally I think that it's looks with it's orange stripes is kinda Republicish, especially "Advanced Recon". So adding HK-50 themed skin would be really cool, especially for imp characters, and also a nice surprise for those who played KOTOR 2 and have been a fan of Star Wars TOR era for so many years. Please make it happen! May the Force be with you!
Here's a couple of images:
https://imgur.com/a/eKFsr