Get something like LTSC or a distro labelled enterprise that has had telemetry disabled, onedrive doesn't install by default, updates are gimped so you only get what is absolutely critical, other stuff done too and some updates will be included. Also FF and a media player (I think mine is potplayer) bundled so you don't use M$ shit. Most will have 7zip bundled too.
Probably like 4GB or something, some distros come with the usb tool but I burned a disc.
There are plenty of custom distros on torrents, idk about the sources you use though.
Install without key and then afterwards you worry about that (I'm sure you know what to do).
Don't create M$ account installing either.
