But of course.
Carrying on with the TF2 concept, you could have one of the invisibility ring locations where Abe becomes invisible, accompanied with
this line. And maybe
this one as he runs past some enemies.
This other one just popped into my head. Take the "Visit to the Doc" cutscene from Stranger's Wrath, from the point where
Doc places the stack of papers on the desk, after which
Stranger puts the money next to the stack, and after which Doc mumbles something (here could be a short Medic laughter) and
puts down the papers with the costs of the operation on them, followed by
Stranger's surprise. And put in the voice responses I linked in at each part.