LOL. I LOVE MK1's music. And even if I didn't, I love the game and if I can help MAME offer a proper rendition of it, I will help in whichever way I can.
If the devs really won't take these files as reference, I really hope you're right and someone turns up with recordings from the actual machine.
If anyone sees this and know someone that can possibly help, I'll really appreciate it if you told them to do so.
As I said, it's really sad that MAME doesn't do justice to this great game.