Boston Bees
Bumblebee
I wonder if a "double shallow" frame size would work.
It would work in the same way that single brood, 14x12 and double brood work, in that it would be too large for some colonies, about the right size for some colonies, and too small for other colonies. There's no right answer to what the correct size of frame is, which is why all these frame sizes persist, alongside Langstroth, Layens, Warre etc. If you manage it correctly, it will be fine.
PS: Bees don't make a huge mess between the two layers of a double brood box, so I don't see why that should be an issue.
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