I have good news and bad news about the footage
Good news: it exists and has the audio for sure
Bad news: the camera is rarely ever pointed at the actual Karaoke screens and spends a large chunk of time on either the person sitting next to me or the ceiling. This is because Boston had workers literally patrolling the seats the entire con to make sure no one was recording, so I wasn't able to adjust for a perfect angle or even set up a good one without being noticed.
Good news, though: I had backup methods!
Here's the entire karaoke in decent quality sound (audio only, though)
https://litter.catbox.moe/bg17yg.m4a