Is it still within the top of the sight glass window?
I over filled mine last year by 2 or 3 mm over the max fill line and like you thought about draining some out via a vacume pump and the oil fill cap. Couldn't get a piece of hoze small enough to get in far enough and after checking it every so often found no signs of foaming.. I've just riden it as normal the last year with no problems.
Will be a little more careful when filing it up during this years oil change.
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