I estimate that mod placed a file named (or named similar) "HK-50.utc" or something, a file like that is used extensively during the game and if it is inside the override it'd break every NPC with the tag "HK-50" for example.
What is sadder, yet beneficial for you, is that the restored items are restored in TSLRCM and M4-78EP.
In my current Playthrough it has provoked that the HK-50 squads found along the game do not attack (except the very first one in the Polar Plateau).
I've had to uninstall it.
Which outfit exactly would you want him in? I'm considering it as an optional patch for an update, but I'm not sure what to give him yet. I could put him in the silver Sith armor but I don't thinkthat would make him look more important. It's used for a lot of generic guys like the governor of Taris who doesn't even have a lightsaber. But I don't want to give him Bandon's outfit because I feel that should be unique to him. The third option is some sort of new outfit, maybe a reskin of either, maybe a little modeling work - which I can do, but I still don't know what I'd want for him. I'd have to think on it. I'd consider the same for Yuthura, but I just haven't had an ideas yet.