You can do it yourself!
To streamline your own handle is very easy and only takes about 30 minutes.
Just use your sanding wheel to grind it to the shape. Have a glass of water available to dunk it when it gets hot. You can use a hand file for the hard to get places if necessary, but I didn't need to.
Once you have the general shape, go to the scotchbrite wheel and do the fine tuning.
Hand sand with some fine sand paper.
Polish it up with some aluminum polish. You can get Mother's aluminum polish at Walmart, etc., for a couple of dollars. It is a common product for motorcycle drivers and will make it shine like chrome.
If you are really weight conscious, you can drill some holes in the bottom of the handle lever to lighten it. (Don't drill all the way through, of course.)
Good luck.