You can get a freewheel off without finding the right tool if you don't mind destroying it.
Screw off the face plate with a punch (clockwise) and lift off the cogs and the rotating part of the freewheel. This reveals the part of the freewheel that is fixed to the hub. There are relatively flat areas where the pawls are attached where you can clamp it in a vice. It is relatively easy at that point to screw off the remaining part of the freewheel body.