Jim
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I don't expect that the steel crank gear is worn
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1/ This is a dangerous assumption
2/ If you look at the tech spec book its obvious that the 0 was the undersize and 1 was the oversize in the machining tolerance (which is why they permitted 1 Item of the other spec)
3/ I think your 0.12 is to high (and therefore out of spec) but until you put in new bearings and test it you won't know as measuring it now will bear no relationship to what it will be when you disturb it as all the wear in the journal/bearings and teeth will be reflected in this backlash measurement
4/ I'd measure it during the install and if still out of spec change the crank gear, if still this far out then get a machine shop to check the crankcase axis distance because maybe someone has altered it by a bad line bore? or you have a faulty factory case that a sloppy porsche employee let slip thru
HTH Neven