You might try renaming the ones you want to use to match the filenames of the ones which are currently used, although I don't think this is precisely what you were looking for since it would probably not change what the other players hear.
-DOOMBRINGER-
"DOOMBRINGER, make a parking space IMMEDIATELY!"
"DOOMBRINGER declares it to be SO!"
"DOOMBRINGER, I command you to lay siege to THE ISS!"