Easy solutions:
1) Ditch the bar end shifter idea, return them to the manufacturer, just get some new Ergos but use the right Shimergo setup this time, rather than the wrong one you were using before.
What's the "right" Shimergo setup then?
I never had much luck getting the "hubbub" method to work properly (when using 10-speed Campag Ergo shifters from 2006 and a 9-speed chain and Shimano XT rear mech - front shifting was fine, obviously, with the ratcheting on the left lever), nor even did various bike shops when I printed out the instructions and photos and showed them what was involved, when I needed to change gear cables. The rear would always be problematic on some parts of the cassette e.g. jumping two at once etc.
Also my current levers really are knackered, so would need to get new ones, and the older pre-Quick Shift/Ultrashift levers are not easily available anymore - the ones that don't have indexing on the front at all, just ratchet both ways. I'd understood that the later Campag levers index the front mech on the donwshifts, so can't guarantee compatibility with all (triple) front mechs? Or would Ultrashift Chrous and above not be a problem with an XT Triple mech?
I've heard that Campag 10 speed works with Shimano 8 speed, but I don't really want to go 8 speed.
What would be more interesting is that I think Post 2011 11 speed Campag Ultrashift shifters (which these days means just the Upper end models) will work with Shimano 9-speed - but I'm still concerned about the shifting on the front mech, or would this be fine with an XT triple front mech?
TBH though, I'm just a bit fed up with a finicky indexing and want something that just works and is reliable on week or longer tours - hence why I'm now willing to give bar end shifters a go...
2) If you're replacing them, FFS, just get some new outer cable!
3) Gutted Campag shiffters plus bar ends just looks wrong. Don't do it. Please.
Why does it look wrong? Have seen plenty of touring bikes with bar ends and Tektro R200 or Cane Creeks, which look very similar to my Veloce shifters, and it doesn't look that odd e.g.
http://road.cc/content/news/110745-just-hewitt-cheviot-seI'm open to the idea of using other brake levers, but not sure I like the shape of the hoods on the Shimano BL-R400 and thought that gutted Campag Ergos are likely still to be better quality than Tektro levers.