MixEmergency supports the playback of .CDG files. These must be in the same folder, and with the same filename (except for the file extension), as the MP3 file that they are played with. You will also need to be using a version of Serato DJ that supports the loading of Karaoke files (the most recent versions do). They play in MixEmergency similar to regular video, i.e. they play as the full output of that channel. Karaoke files have quite low dimensions, so the output doesn't always look so great. As for sourcing these, I'm not really familiar with which DJ pools provide these.
