I have shimmed as much as 2mm in the past.I have not,however,used the setup you are describing.
If the crankset is on the bike now,you can use a 2mm allen to see if it clears between the left crankarm and the chain stay.If so,shim away.If not,and you need the right crank moved to the right,you must get a longer spindle.If you cannot find a Campy to suit,you can get a Phil Wood in any imaginable length.Note that the taper needs to be ISO,not the Japanese JIS.
dan
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