Thor, try to find the file where the Windows iTunes stores its cataloge. I somehow can only link to the German info page but maybe that helps:
https://support.apple.com/de-de/guide/itunes/itns2999/windows
Yes, I know about the library file thing. So should cut down time somewhat if I re-install an older iTunes, or install MusicBee (which can read iTunes library files). But of course still a hassle. Right now, I’m in the process of “cleaning up” my collection of some 3000+ albums (whittling down certain albums, removing titles that should only be on my back-up, not on my hard drive, and so on).
Maybe one day, I’ll get up to snuff to Nick’s fancy-schmanzy solutions! 😀