Unless you have a specific constraint not mentioned in your post, it would probably just be a waste of time compared to just downloading an existing rip from a torrent site. Especially considering most stuff on Disney+ is fairly mainstream and should be easy to find.
Trying to rip from Disney rather than finding a source to download it would be more time-consuming and would likely end up with worse quality than what the various scene groups get out.
That's for sure one of the bigger constraints possible, and one I'm most familiar with as my first language isn't English. You can still usually find stuff though, although it might require private torrent trackers or Usenet.