55's very wide and I don't think that will do it, might get you to 50mm.
What's it for out of curiosity.
Edit to answer the question.
Phil wood do length to something silly in the 140/150 region.
Paying for it though
That Phil Wood BB is a little too expensive I'm afraid.
I've got a 2005 p1 frame that I'm running single speed.
Up until recently I've been using BMX cranks which allow me to space out the chainring using washers. However the bearings on these have bit the dust and I was looking to change the crankset for something a little lighter.
My rear wheel uses a DMR revolver, and the centre of the freewheel cog is around 12.5mm from the inside of my dropout, so I hope I got my calculations current when I landed on the 55mm chain line figure.
New the cranks I've ordered may have the 44mm chain line with the chainring in the inner position, so maybe moving the chainring to the outside would give a 50mm chain line?
Even so, a 122mm spindle would give another few mm, maybe 52mm, and maybe I could add in a BB spacer also, along with chainring spacers, but ideally I'd like to avoid using spacers if possible.
It's a shame the un55 comes in 127mm if you get the 68mm version and not the 73mm version, otherwise I could just fit and forget.
Would it be worth looking out for some different cranks?