Cutting hole in a mirror

Any of our experienced glass cutters here ever try it on a mirror? I have a side view mirror my my bicycle and the kick stand failed me yesterday and the mirror shattered. I got a replacement but I figure if I could get someone to cut a new round mirror for me with a saw I could have a backup or sell off the old one to someone else.

Thoughts??
 
They sell a special tool for glass. I am assuming it would work with Mirror as well. Look for diamond tip type of tools
 
I think the coating would only be ruined where the saw cuts, not sure though. Looking to garbage pick some mirror to try one of these days.
 
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