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mi7rennie
It might work, someone put 650b 2.1 tyres on their (stainless) Croix de Fer, so 50mm is definitely a possibility.
I think you live near where I work, and I'm getting the Big Ben in 650b, and got a spare front 650b disc wheel (Arch laced to Hope), could be an easy way to see if that tyres can fit.