I had a thread on Reddit that linked to an early M4-78 mod created a long, long time ago which didn't even use Vash in it. I'd love to have outside sources give some opinions. I haven't played it myself. It was created by a modder named Darth Shan way back in 2006. If anyone is interested in using this mod and giving feedback, I'll have a place for it in one of my videos in my (yet unreleased) YouTube M4-78 Documentary. You can provide text, or text with your own voice saying your words. There is a walkthrough provided by the mod author in the package so that should speed things along for you.
If you're a person that doesn't have a problem starting up another playthrough virtually at the drop of a hat, you're cordially invited to help!
A note: I am unsure of the compatibility with TSLRCM and/or the M4-78 EP, so I will leave that in your hands or whether you'd like to try it with either of them. (You are most welcome to try though!)
Here's a non-GameFront link for it:
Droid Planet Mod by Darth Shan
Thanks for your attention, KOTOR community!