We also have a steep standing seam, metal roof. I've always wanted to build a pair of felt sole, magnet embedded shoes for roofing work. I check our chimney once a year and use a hunting stand harness that is tied off with a rope to my tractor. I built a simple 2x4 fixture to place on the ridge cap so that the rope wouldn't crease it. Steep, standing seam metal roofs are great - as long as you don't have to get on them
