I've never tried it and I don't think I would, but how about wrapping the bar tape over a tube large enough to pass the cable housing? Then you could slide the housing in/out for replacement without disturbing the bar tape. Sort of an external, internal routing. Of course it would probably make an annoying rattle unless it was a close fit.
But I think that ending the tape at the center of the bar so that it can be easily removed/replaced, as 79pmooney suggests, is the best way.