That's an old rare bird. The tool for it hasn't been available in the US for years, bit possibly a modern BMX tool might fit. You'll have to visit a fairly old and complete LBS with the wheel in hand to see if they have one to fit by trial and error.
BTW- if the freewheel is OK, you don't necessarily have to remove it to service the hub. Disassemble the axle from the left side and slid it out. You'll have to reach in past the freewheel to clean the right bearing, but that shouldn't be hard since the opening is plenty big. Then make sure the right cone and locknut are tight on the axle and reassemble finishing and adjusting on the left side.
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