'Nother quickie screenshot post.
Just wanted to drop out my photographic (sort of) evidence that I succeeded, and the girls can now use stealthboys.
Should add a whole new level of sneakyness to using one of the girls as a sniper's partner.
Works like chems. Leave the stealthboy(s) in the companion's inventory, and when they enter combat mode they'll use it and become a rather deadly shadow.