Cam

Yes, I was thinking of a degree wheel, too, but got crossed up mentally on mounting it. You could use one of the sprockets that go up front and retain the indicator with a threaded collar. This only requires pulling the harmonic balancer. Use a spark plug hole piston stop to index it to #1 TDC. And have all of your spark plugs out before you rotate the engine with the breaker bar.
Or use your Front Pulley to Mark some holes in the Degree Wheel and then Mount it to the Balancer?