Paul,
Just to confirm this is a 2,0 S crank, 66mm stroke, counterweighted.
OK. You measured your rod journals and they came in at 2.242" +/- 0.0002"
Converting from decimal inch, your measurement is 56.947 mm +/- 0.005mm.
And as you correctly quote from the little white book, the wear limit is 56.960mm for the "Shaft" of the "crankpin to connecting rod bearing."
So, you're below the wear limit all right. And in that situation, the correct thing is to regrind the crank to the next size rod bearing, in this case, 0.25mm undersize.
I faced a similar situation with my original 2,0 crank. You can see how the measurements stacked up. I thank Tom Butler (tom1394racing) for his development of the graphs we use to visualize this. Here is mine:
Here's a link to the whole thread. I have learned a lot since then I like to think.
http://forums.pelicanparts.com/911-engine-rebuilding-forum/328636-measurement-instruments-metrology-2.html
As you can see visually, the wear limit is a long way below the max clearance.
The bore measurement is 57.020-57.059.
At 56.947mm without your tolerance range, your clearances are between .073 and .112mm vs. the bore of the rod. The standard clearances are .030-.088 at the max, and the wear limit clearance is 0.099mm.
If we give you the tight side of your tolerance of .005, the crank is still between .068 and .107mm. On the loose side, between .078 and .117mm. One tenth of a millimeter is a pretty big gap, you can hear that clearance on the valve adjusters for sure!
It's unlikely to me that this gap could be made up with the rod bearing. If the bearings are in spec on correctly resized rods, then you should measure between 57.020 and 57.059 bore diameter on the big end.
Anyway, long winded way of saying that an extra $200 is a lot for undersize rod bearings, but if it were my engine I'd have the crank ground to the tight end of the factory spec, micropolished to a nice Ra, make sure they got nice fillets on the edges and call it cool.
Others may have different opinions or tell you to just go for it, but the numbers are the numbers. Of course there is a rounding error in going from decimal inch to the factory specs, you might borrow a metric mic and repeat the measurements for more of a picture of what is going on.