Have you tried the CeeGees mounts? About the only thing I don't like about them is I wish I could move them outboard just slightly...since they clamp on the straight part of the bar they end up fairly narrow. Although, I do have to say I've gotten used to my elbows being in so close. But, I'm sure others might not like them that narrow...
I agree on bringing the "handgrip" portions in closer together...also, maybe the "loops" could have a short straight section in the middle of them (running fore-aft)?
A very low profile brake lever made specifically for that bar that could be mounted on the outer portions of the "loops" pointing down would be a nice addition as well.
Actually...this all gave me an alternate idea :-)