I find that the best way to handle this is to use the "Album Artist" tag.
For albums that don't have the exact same artist name for every song, (but are not "Various Artists" compilation albums) put the name of the primary artist there.
Then, in the "Group By" setting, select one of the options that sorts by "Album Artist". It seems that with this configuration, albums that don't have an "Album Artist" entry will still be sorted by "Artist".
While one could use the "Album Artist" tag for all albums, I only use it for exceptions, like the example given in the original post.
Side Note (regarding compilations, aka "Various Artists":
For compilations, while some prefer to use "Various Artists" as the "Album Artist" entry, I prefer to check the "Compilation" checkbox instead, and leave "Album Artist" blank. Strawberry honors that tag, and will create a "Various Artists" heading in the library.
This is a hold-over from my years of experience with iTunes, which uses that "Compilation" tag. This may not be a universal solution, but in Strawberry, at least, it works for me.
