I have never removed serrations, or worked specifically with G10, but I have done major reshaping on a wide variety of blades, starting with a file and working my way down to emery cloth then several different grit stones, and I can tell you that it is a lot of work. And, no matter how much thought you put into it before starting, including paper drawings and marking on the blade with a felt tip, sometimes you end up with a finished product that is not what you were hoping for. Mine often become throwing knives; throw them 'til they break (they usually do), then throw them away.

My suggestion-don't do it. Keep looking 'til you find one you like as is, or have a custom built...