OMT could be considered alternative given that MD's don't learn it. So, in the strictest sense of the word, I guess it would be. However, I'd be very careful how you phrase it, and I personally would not.
What would be better though, would be to talk about your interests in OMT, and why you like it so much. But, I'd hesitate in calling it "alternative" because that could be taken the wrong way too easily.