Originally Posted by skidder

As others stated above, I'd be concerned one of the joints might slip on that multi-extension set-up. Suggestion is to go to a bike shop and see if you can get some BMX-style riser bars that are high enough for you, then put the extensions on the risers if needing an intermediate or higher grip area for more upright riding. I know you can get 4 inch risers, maybe as high as 6 inches. Get some new brake cables too, as you'll probably need to replace those if using riser bars.