Well...this went good...............not!
After removing the correct screw and soaking in penetrating oil, I broke the two "teeth" off of the special removal tool. I think the striker had been in there since 1943 and it wasn't going anywhere.
You know, I think I'm gonna just get a complete bolt from Numrich for $44.95. That's less expensive than just getting the parts I need, as well as another special striker remover tool. When they say "complete" do they really mean it....head, striker (firing) pin, everything?