I highly doubt they'd be secure because of the shape of the stock bar-ends. I had the CGR bar-end mirrors attached to the RhinoMoto Bar-Ends made specifically for the FZ09 and the mirrors never moved. I can't imagine trying to use the stock bar-ends for anything, but Good Luck.
Most are 7/8 clamping diameter- so the only way to do that on the stock bar end will be to have a machine shop turn the bar end on a lathe, or slide your controls and grips in about 3/4 inch and clamp to the inside 7/8 portion of the bar end. If you go that route, you will have to either re-drill locating holes, or grind off the locating tabs on the clusters.