Transition should pose no problems. If anything, you may transition better than your fixed wing yoke bretheren. When I first flew aerobatics in a Pitts Special S2A (really wild stick), I took to it like a duck to water : years of flying in helicopters previously had conditioned me to fly with a light touch. My hand just fell into the right place as soon as I sat in.
Although there're no low-G issues as in teetering MR heads, be gentle with pushovers in something like an S2A, or you may send your instructor's head up through the perspex !