Is it possible to ask Dominic politely, if he might voice the stump joke for a fan patch? (The Classic Talkie CD Edition Project over at LucasForums, to be exact)
After all, he is known to be a fan himself, and he even voiced that awesome april fools joke some years ago. If he agrees, that would be awesome.
Just in case, the text goes like this:
"There's a hole at the base of this stump!"
(Guybrush is reaching the stump.)
"Wow! It's a tunnel that opens onto a system of catacombs!"
"I think I can squeeze through--"
(The game requests disk 22, disk 36, and finally disk 114. Guybrush stands up.)
"Oh, well. I guess I can't go down there."
"I'll just have to skip that part of the game."
Here is a video of that particular scene: Youtube video