"Purple Chick"-ish Queen collections?

I wonder if there are collections from Queen albums which chronicle the many takes, alt versions, unreleased tracks, etc, as There are for The Beatles?

Often they are put out by an anonymous "Purple Chick."

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Thanks.

The closest thing to that is a few takes of The March Of The Black Queen that were played at a fan convention a few years back. Such a thing hasn't been released.

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