In fact, a booster might not do much to a superfuzz. There's a place in the superfuzz where the signal, either octave doubled or not, is fed to back-to-back diodes to ground. Once you get more than maybe +/-0.8V (if you use silicon, or 0.5V if you use the original germanium) it won't change much if the signal feeding it doesn't have a DC shift on it. A square wave of any size sounds like a square wave, tonally.
Overloading the input amplifier an/or octave section might get you some signal perversities in the face of big overdrives, but that will probably produce more gating than audible overdrive. And it will make for more audible noise.
Like every musical, test it. But a booster in front of a Superfuzz may not be all that great.