After a lot of searching I came up with what seems the best aesthetic way of dealing with the Rohloff shifter - with the aid of the Rohloff website.
It's here:
http://www.norwid.de/komponenten.html
A specially made headstem with ability to accept the twist grip (which is 6 cms long)
There's another picture on the site somewhere that is hard to find.
Anyone game to make one and post a picture of your efforts? I'm keen to get one as it isn't cluttering the handlebars.
SM