I haven't measured the thickness of the teeth on DA 10-speed rings yet (and I think that is the critical dimension), but I would bet that a 9-speed crankset and rings would be fine (in past, 8-speed cranks and rings worked fine on DA 9-speed chains and set-ups even though the 8-speed rings were very, very slightly thicker than the 9-speed rings).

But you will have to use a 10-speed front deraill. to get perfect shifting, though. The 10-speed chain is very narrow and the 10-speed front deraill. is narrower to match it.

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Where would you want to swim ?