Is it possible to migrate keyboard shortcuts for all my applications via an export?
It depends on how you have defined the shortcut keys. The files responsible for storing these preferences are in the usual place: ~/Library/Preferences

You could simply move the files that store the preferences over to the new Mac:


com.apple.symbolichotkeys.plist
com.apple.universalaccess.plist
com.apple.iWork.Keynote.plist
com.apple.iWork.Pages.plist


If you were good at parsing JSON or XML, you could do the export to a text file as well using the plutil tool.