Doesn’t surprise me as it would probably be a completely different syntax. Someone has gone to the trouble to setup key commands in Cubase that emulate the behaviour of those in Logic, then exported that file and included it in the installation files. More cannot be expected. It’s similar to trying to install a Mac program on a PC. Each DAW exports these files in a syntax which it understands and can re-import, there is unfortunately no industry standard for this format.
If you modified these commands over years, there’s not much can be done except you modify them anew in Cubase. I just thought importing the Logic standard might give you a more familiar basis to start with.
I too have a Contour Shuttlexpress, and can recommend them. I also have a custom cubendo keyboard with all the important Keycommands labelled and colour coded - also a great boon if you can find one.