Install some sort of networking, and transfer/administrate remotely...
SSH in linux, or turn on Windows' telnet client, or just run PC Anywhere or something like that if all you know is mouse clickin'..
Share your roms folder and "push" them on to the cab from another PC.
That's how I'd do it.
Actually, I'd restore the Wizards of Wor cabinet and leave mame on a computer where it belongs, but that's just me.