I actually have that headset tool.
Though doing a quick search pulls up some modern options as well. I don't know you will find one commonly but maybe ask an older wrench at your LBS maybe they might have one.
For the stem I would use a non-ball end hex wrench and loosen, you maybe even put a small piece of pipe for leverage on the L or T handle wrench, Don't loosen all the way though just enough to where it should move and sometimes a mallet will knock it enough to allow you to lift out.
I am unsure on the freewheel if you can get some better shots of it and maybe the maker I might have a better shot figuring it out but there maybe someone who knows freewheels better than I.