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spotter-
I doubt my bike would take 62mm
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.
edscoble
If you're going 650b, there's some massive tyres you can get, like this in 62mm;
If it's too big, then the modest 50mm Big Ben is ample;