Thanks for your help @PGriffith, I was able to successfully attach the event dispatcher and find some usable Key Codes through trial and error 
The strange codes reported in Cherry Designer were actually for some common utility keys: Home, Insert, etc… I’m guessing their driver handles the mapping to the proper code?
I placed this code in the action event script of a button on a test page:
from java.awt import KeyboardFocusManager, KeyEventDispatcher
class printKeys(KeyEventDispatcher):
def dispatchKeyEvent(self, event):
try:
print 'got key event: ' + str(event)
return false
except:
pass
kfm = KeyboardFocusManager.getCurrentKeyboardFocusManager()
kfm.addKeyEventDispatcher(printKeys())
I eventually found the range of hex codes that map to the F13+ keys, which is suitable for our usage.
For any future searchers: if you don’t include the try block and your event code errors out, you’ll break the key event handler stack and lose the use of your keyboard in the designer 