You need to inhibit MAO in the digestive tract to make dmt orally active. Smoking harmalas is like administering them systemically, some of them will end up in the gut and inhibit MAO, but how much inhibition you'd get? Not much really, if any, I'd guesstimate.
When you eat harmalas, they first inhibit MAO in the digestive tract as they move through the bloodstream and the rest of the body eventually. It is the digestive tract where you first and foremost want to have the strongest MAO inhibition for oral dmt activation and the way to achieve this is only orally.
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