It sounds EXACTLY like all the Westlake demos on Bad 25. I'd be more than fine with it.
You're just forgetting something: what they did for Now and Then was strip the vocals from the instrumental. For a proper remix, they'd need to do stem separation and that's not possible. Peter Jackson's MAL was used on the remix of Revolver, but they had the original 4-track masters.
One thing is separating each element on a track consisting of guitar, bass and drums. Splitting the stems of a 24+ track mixdown is a whole different game.