Vintage Peugeot Fixed/Single Speed Conversion

I am trying the smae thing with an 80's Peugeot frame. Can you tell me how you solved the BB problem exactly? I have measured the thread size in the frame and it is 26TPI (threads per inch). I believe standard British BB's are 24 TPI. IS this why you couldn't find one to fit? Did you end up with the threadless option. I thought this was gonna be easy! Good fun though.

I have had a few 80s peugeots and still have two. The early eighties generally have swiss BBs (Same as french but LH thread on drive side). Mid eighties onward have english BBs. Bottom bracket cups for the swiss type are like hen's teeth. If I needed to replace one now, I would use a threadless BB.