I should have thought about the IMS procedure.
How about drilling and tapping a hole in the pulley and then drilling a small matching dimple in the block to accept a set screw? If this is done while the engine is locked at TDC via the flywheel it should be very accurate. Would this be enough to hold the timing during the procedure?
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1990 944 Turbo
2007 Renault Clio RS 197 (Sold)
1998 Boxster 2.5L Track Day/ Race Car
2011 Mistubishi i-MiEV 
Norway
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