How to add keyboard shortcut to Photos

So adding keyboard short cuts is easy. You do it in system preferences and I know how to do that.

My problem is that I want to add a keyboard shortcut to: Export Photos

Apple tells you to use the specific command when adding shortcuts, but the command for Export Photos changes every time you select a photo. If you select one photo the specific command is: Export 1 Photo .... if you select 4 photos to be exported the specific command is: Export 4 Photos

So, the problem is that the command changes dependent on how many photos you select for exporting.

I have already created a shortcut for Export Unmodified Originals, but this is not always the command I'd like to action.

Does anyone know how to create a keyboard shortcut for commands that are not fixed?

Thanks.