Unfortunately, one thing functions can't do is compare tags from one file to another file. However, if you marked your DJ mixes with a particular genre or grouping or custom tag, you could use that tag to write a formula that would be applied to those files, but not your other albums.
Speical Sort Tag = $If(<Grouping>="DJ Mix",<Album Artist> <Year> <Disc #>,<Album Artist> <Album>)
That would create a sort order where DJ mixes were sorted by Album Artist/Year/Disc#, but other albums are sorted by Album Artist/Album. Obviously you can tweak it as desired.
Once you like the formula, you'll still need to put in the main panel or (probably better) use a custom sort order.