iCloud Music Library
"Do you have any scripts that work with iCloud Music Library/iTunes Match tracks? Like, to delete the cloud uploads and re-upload tracks?"
No. AppleScript cannot access anything in the cloud. Here's one of the reasons why: While it's certainly possible for me to write a script that arbitrarily deleted local tracks and files on your computer (with or without your knowledge), that's OK because presumably you knew stuff was going to get deleted by running the script. It's your responsibility, and Apple doesn't care what you do on your machine. You could set in on fire if that's what you wanted to do. Or install Flash. However, stuff in the cloud is Apple's responsibility. And they have pretty much guaranteed you that your goods up there are safe. So they're not going to let an AppleScript (of all things!) have arbitrary access to your goods in the cloud where it could potentially be a bad actor.
AppleScript can manipulate cloud tracks locally; for instance, copy such tracks to a new playlist or edit their tags. But anything to do directly with the cloud is strictly out-of-bounds.