Cannondale Aficionados / Owners

Anyone put an eccentric bottom bracket into the BB30 on a Cannondale with internal cable routing? Trying to figure out a neat solution to turning my 2014 aluminium Synapse disc into fixed. Have got a Wheels Manufacturing eccentric for Hollowtech II cranks but the bolts and axle foul the cable guide inside the bottom bracket, push it out of position and stop the rear brake from working.

I reckon I've got three options:

1. Ditch the rear brake. Not ideal - would prefer a brake if I can have one.
   
2. Run full length outer externally - need to use zip ties or stick-on cable guides. Ugly.
   
3. Drill out the cable stops in the frame and fit a full length outer inside the frame, hoping that it doesn't rattle or rub the axle where it passes through the BB. Seems a bit extreme.
   
   

Any ideas?