Can I cut down an OE biscuit mount if I need to?

Jim Lusk said

There's no way to make the mount thinner unless you cast the rubber yourself as the mount is metal on both sides of a thickness of rubber.

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^^ that's right. But I guess you could cut out all the rubber and weld the two steel plates together. Keep in mind that the thinner mount will lower the engine AND shift it to the outboard side.
And yes it will be rougher,but, like said above, you gotta do what you gotta do.
What are your other options? modify the frame mount, or modify the engine bracket, or get the correct K.