jambon's Walvale porteur

A few more parts have arrived but the bike looks very similar, new bits:

• Brooks B17 Ti
  
• Campagnolo Chorus calipers
  
• Campagnolo Chorus chainset
  
  

Got a little insecure after all the talk of stepped ferrules in the porn thread.

As the rear derailleur cable is routed internally I can't fit the chainset and BB until it's all plumbed in. Parts in the post:

• Campag Chorus BB
  
• Campag Chorus headset
  
• Campag Chorus chain
  
• Campag Chorus cassette
  
• Campag Chorus rear mech
  
• IRD SOS power ratchet Thumb shifters (thought I'd never find a pair)
  
  

Any suggestions of bar end brake levers (in silver) that accept the brake cable inside the handlebar? I don't want to drill the ends of the handlebar. The levers I've fitted are Tektro TL720, being black I can sand them back and polish to match the group, but thought there might be a lever that's already silver and less aero.

Mafac 1B's would be my preference but seems they're quite hard to track down.