I'm not familiar with the particular circuit...but I've just googled the schematic - adding a 500 ohm resistor in series with the pot will give a range of 500R (pot at minimum) to 1k5 (pot at maximum)
if you're saying it sounds good from the halfway position, then you likely want a range of 500R (pot at minimum) to 1k (pot at maximum...ie as it is now) ...to get that characteristic, you'd need tp place a 500R in series with the pot & a 1k resistor in parallel with the pot...this will give an effective range of 500R to 1k.
Will it work? Since the circuit will see between 500R (your preferred fuzz starting value) & 1k max (which is what the circuit sees at max presently), then yes, of course it will work. Furthermore, you'll have beter granularity (for your stated preferred fuzz kick in threshold) along the whole sweep of the pot.