Thanks for the suggestions!
I got my hands on a harmonic balancer puller that should do the trick if I can get a shorter pusher screw for it. I only have 2.5" to work with!
my plan "B" is a short piece of shallow Unistrut with a 3/8 bolt and captive unistrut nut for the pusher.
I didn't have time to work on it today since I had to get the bottom paint on between weather systems!