Could try that. I have a 4 inch grinder, but it would take quite a bit of material. When I bought a multipack of wheels, a few thin discs came with it, but don't work with the grinder. The nut won't come close to snugging down on it. I've heard of people stacking washers in there, but that seems like a good way to work itself loose and explode in my face.
I have a air cut off and it seems to have died a few hours ago. Was working great...though I didn't try it on the motor shaft/aluminum.
If I can use a thin wheel in an electric grinder, my life will be much easier.
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