The "Profile Stoker 26" bar that I use has two holes, one closer to the end of the bull bar on the lateral side, and one closer to the bend on the medial side. My aero lever starts the cable on the lateral side of the bar then the cable goes through the bar to the inside side. The cable then goes under the tape to near the stem. The holes are beveled to accomodate the cable housing going in the direction of the bar. I would think you could drill a hole the size of the o.d. of the cable housing, then stick a rod into it (something close to the cable diameter) and bend the hole so it's angled to better match the cable direction.
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