My apologies for going silent on this front… thank you for your further replies.
I’ve made the leap to bullhorns (fitted over the w/e – very nice feel) and I’m currently running singlespeed while I find the ideal soultion.
I have fitted bar-end-plug mounted brake levers that route the cable straight down the inside of the bar and out through a hole further back near the bend, which is very tidy.
Ideally I’d like bar end shifters that route the cable internally (which I’m not sure you can get) and then fit some clamp mounted brake levers to run the cables externally.
The hunt continues, though with the added benefit that I know at least the brake cables are out of the way should I go for a clamp-mounted shifter solution (like that Pauls jobby). I’ll have to get my hands on some bar end shifters and have a look at the throw, see if it’s going to be a viable thing to convert them or whether it will be uncomfortably awkward as JoB says.
Let’s hope my LBS is feeling patient next weekend… 🙂