Grimtooth's Guide to Undermountain?

Last night while playing Lords of Waterdeep and talking about the city with friends, I had a fun idea. What if Grimtooth the Troll made his way to the Realms? Halaster used Undermountain for experimentation and things.  The troll would obviously go to Undermountain and use it as a testing ground too. I know this sounds a bit goofy, but I think it would be a fun way to include an iconic character old school NPC into the Realms. Maybe if I ever end up running Dragon Heist properly, I'll follow it up with this idea. 

What do you think? Would the trapmaster set up shop in Skullport and use Undermountain as a proving ground for his work?