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In a case like that for a one off use, I would make an mdf or plywood spanner for the pully. I could really take my time over it for £190.
Come to think of it a smooth circular "spanner" that fitted the outside diameter of the pully exactly, would grip well enough if it were then split in one place and clamped over the pully.
What about gripping the pully with a strap wrench? Not a chain wrench, unless you wrapped the pully up well.
It might need two pairs of hands to steady things and make sure it didn't slip? But worth a bit of application to save those sheckles.
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