I think these should do it, I used a pair of them a while ago with some Tiagra brifters which didn't have aero cable routing:
http://www.chainreactioncycles.com/jagwire-rocket-2-cable-adjuster-shimano/rp-prod150987?gs=1&gclid=CjwKEAjwgo6_BRC32q6_5s2R-R8SJAB7hTG-x-mdC0xxY7J7MBMIMwgONH_D_aAS8DVUj1rDViRYhRoC2U3w_wcB&gclsrc=aw.ds
Those are for gears not brakes!
Yeah it's a bodge, but is there any reason you can't use them for either brake or gear cables?
@dancing james started
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I think these should do it, I used a pair of them a while ago with some Tiagra brifters which didn't have aero cable routing:
http://www.chainreactioncycles.com/jagwire-rocket-2-cable-adjuster-shimano/rp-prod150987?gs=1&gclid=CjwKEAjwgo6_BRC32q6_5s2R-R8SJAB7hTG-x-mdC0xxY7J7MBMIMwgONH_D_aAS8DVUj1rDViRYhRoC2U3w_wcB&gclsrc=aw.ds