If that doesn't work out, and you're still interested in a Brassmaster, I remember that VFE makes something based off it called the Woodchipper or something. Or, as someone said earlier, an Iron Ether Oxide.
The FY-6 is often called the "Companion Fuzz." Shin-ei also made a Superfuzz, the FY-2, which Wattson also makes a clone of, but it and the Companion/this modded clone of it are otherwise unrelated.
It's based on the Companion Fuzz, not the Superfuzz, if I'm not mistaken. Good luck with the hunt!
EDIT: Maybe email Wattson directly and see what they say.
If fuzz can be a vastly different-sounding distortion than overdrive, how is it redundant? By this logic, wouldn't owning different types of basses and amps also be redundant?