I was recently hired with the fixed wing minimums for the ATP. I too flew EMS and I had quite a few opportunities with the regionals available. This biggest deal for will probably be the written, but there are a couple companies that offer it in their training. If it is something you are truly interested you should have no problems. Maybe get some multi time if you haven't flown fixed wing recently. I flew the EC-145 and did alot of PT xfers in weather so I was up to speed on IFR flying. If you were flying VFR study up on the instrument flying. Other than that good luck man.