Lol. EXACTLY what I did!
Now I have braided lines I was able to route them differently so that there is loads of slack. It just moves around more with the bars. I routed some of the cables behind the forks and others slightly differently. Some of them are stretched nearly to max on lock now with bar risers and the high road bars. But I can use the stock horn and the motrax hootaz at the same time now the brake line is routed differently. I'll have to post up pics of how I did it later. It's not any longer than stock, but you can place it differently so it doesn't stretch on lock.
Basically , I found that the important things when doing this is to check the cables aren't stretch on either lock or in the centre position and also that they don't get pinched.