Look what I found in the exiftool source code:
lib/Image/ExifTool/Nikon.pm
# nikon lens ID numbers (ref 8/11)
'00 40 2D 2D 2C 2C 00 00' => 'Carl Zeiss Distagon T* 3.5/18 ZF.2',
'00 48 32 32 24 24 00 00' => 'Carl Zeiss Distagon T* 2.8/21 ZF.2',
'00 54 3C 3C 18 18 00 00' => 'Carl Zeiss Distagon T* 2/28 ZF.2',
'00 54 44 44 0C 0C 00 00' => 'Carl Zeiss Distagon T* 1.4/35 ZF.2',
'00 54 44 44 18 18 00 00' => 'Carl Zeiss Distagon T* 2/35 ZF.2',
'00 54 50 50 0C 0C 00 00' => 'Carl Zeiss Planar T* 1.4/50 ZF.2',
'00 54 50 50 18 18 00 00' => 'Carl Zeiss Makro-Planar T* 2/50 ZF.2',
'00 54 62 62 0C 0C 00 00' => 'Carl Zeiss Planar T* 1.4/85 ZF.2',
'00 54 68 68 18 18 00 00' => 'Carl Zeiss Makro-Planar T* 2/100 ZF.2',
'00 54 72 72 18 18 00 00' => 'Carl Zeiss Apo Sonnar T* 2/135 ZF.2',
So if exiftool has to look up the lens via the Lens ID ACR can probably use either the Lens ID or Lens Model EXIF tags to identify the lens.
In any case, looks like things are working. Now we need a real lua script. It should be able to run Autorun so that when a non-cpu lens is detected it will look up a configure file for the last lens used and have a menu where you can choose from a list of lenses. We might consider putting all the possible lens combinations that are in the Adobe list that can be adapted to a Canon body in a text file so users don't need to figure out that the way a lens is displayed in ACR might not be exactly the way it is saved in the EXIF tag.
@Lars_Steenhoff - The lens you are looking for is probably:
AF Nikkor 35mm f/2
Got that from the exiftool code.
@garry23 - It would be great if you can you jump start this when you get back from vacation.