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Isn't the Rawland Ravn design for this. Fat 26"/ mid 650b/ skinny 700c. You'll not be getting hold of one of them in a hurry, but maybe have a look at the geo to see how it works?
https://www.bikeradar.com/mtb/news/article/rawland-cycles-launches-ulv-and-ravn-48176/
Polygon
pascalo
I think you might struggle a bit to make that work unless the frame has a really high BB.
Smaller wheels lower the bike, and the reason why you can switch between 700 with skinnies and 650b with large tyres is because the diameter ends up nearly the same. That however is not the case for 26".
Of course if the frame was specced to run well on let's say 650b skinnies, maybe it could work with 26" also.
In any case, make sure to keep in mind that the BB will probably be lower for the off-roady wheels, and that will increase your pedals striking ruts and boulders etc.