Will,
Ross doesn't generally list Rotary engines in his catalog, but he isn't against them. He has a injection that still lists rotary engines. To run his ignition only you would likely need to get an aluminum e-shaft pulley to install his magnets. He has his own Hall effect sensors. He used to sell both ignition units and full EMS systems. Don't know if he is still doing it individually. The advantage of his system is that he does do aircraft stuff. His business has in fact gravitated towards aircraft since so many cars now come with their own systems unless it is a full custom build they often don't need an EMS. BTW I don't work for them or get anything for recommending their products. I met Ross at Reno while crewing for a friend on a Sport Class entry. Ross was providing an EMS for a very fast Questair Venture running a turbo Lyc. Very good guy. A 4 cylinder unit with dual plug coils will run the rotary just fine. The timing is the same, except that the coil isn't wasting a spark in the exhaust, instead it is firing both plugs on a single rotor. Ross' site still lists his "coil pack ignition" for vehicles with mechanical injection or carburetors.
Bill