It had been done. I forget which show it was, either macna or reefapolooza, but their was class and a video on someone doing it. If you look on YouTube, I am sure it will be there.
You can use a dremel and a diamond wheel, but it's messy. If you have asthma, I don't recommend it; it's very easy to aerosolize particles via that method. Once you have a frag, the best way to deal with them is to make yourself a thin, flat epoxy disk to grow out a fragging colony. That way, you can just cut it with fragging tools when it gets big.