There are some other proposals here:
https://sites.google.com/site/largenumbers/home/2-2/3 There were actually small counterparts to all of those -- they start with the same letters, but end in O instead of A, with small changes to the other letters, if that makes sense.
I've actually been playing around with some googology stuff lately -- working on something I call the "Z-heart" system. Not sure if that'll go anywhere, though.