I use the Novara Safari handlebars, and have successfully mounted the Third Eye bar-end mirrors on Titec bar ends, shown below. This works really very well, as the Titecs make an extremely rigid arm which does not vibrate at all. In my experience, road vibration due to flimsy arms can cause some mirrors to be almost unusable at times - the image is just a blur.

The position of the bar-ends is up to you, but in the position you see here, I don't find my hand positions to be all that restricted. In any case, you could move them around a bit so that the bar ends actually give you even more hand positions than before (especially if you wrap some tape on them).

Neil