A heads up, if you don't want spoilers, you'll want to read the escript before checking out "The Land of Fuhlip and Fuhlop Under the Bridge" or the later "Cause We're the Dwarves" reprises; both have some hefty spoilers.
I can gift you an ecopy of the script if you like.
Sure, versions of some of the main songs would be great for getting the word out! "Dream too Big", "Cause We're the Dwarves", "Substitution", or "Beautiful" would be great.
That said, the project's made to be open; if you're leaning towards another song, just jump in and add wherever you want!
You can see all of the lyrics here, but I'd recommend picking up an escript copy so you can understand the overall story. I can gift you a copy of the escript if you like.