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Without seeing the schematic, I presume that it does need up to 250K resistance to provide the correct amount of distortion. You can use a 500K pot with a 500K resistor wired between lugs 1 and 3 to provide the 250K resistance.  (The taper would change a bit.)  Or you could add a 150K resistor in series at lug 1 of the B100K pot.  This would give you 250K at the full CW rotation but only 100K at full CCW rotation.  This would limit the amount of control you would have.

I looked at the website for PEDALPARTS Australia and They are showing several types of 250K LOG pots (250KA or A250K) as well as 500K LOG pots.