Interestingly, according to
this post over at MAMEworld, a version of Popeye that ran natively on Sky Skipper hardware has just been dumped. This version apparently predates the ones in MAME and that most folks have played, so it does sound as though there were at least two hardware revisions of Popeye.
As a side note, I can very clearly remember playing a Sky Skipper cocktail at a Marie Callender's restaurant in Burbank / Toluca Lake (not sure which side of the city boundary it fell on; the restaurant was shut down three or four years ago), California. What sticks out in my mind about it is that it was the only one I ever saw, and I was really unhappy when we went back there one time only to find that it had been replaced by... Popeye.
While I have no clue if the Popeye that replaced it was a dedicated or Sky Skipper variant, there was at least one Sky Skipper cocktail in circulation in the US c.1982. And I did eventually grow to like Popeye, but Sky Skipper stuck in my head largely due to the Donkey Kong-alike gorilla character wearing a Walkman.