Yeah, that seemed to be the most popular way of doing it when I scanned the RGVAC archive on Google. I went with what I had on hand and used the Atari Audio PCB.
The only "issue" using the Atari audio board is that it needs 12VAC CT so it's not like you can pull the power from the JAMMA harness -- at least I don't know how it would be done (I use a Rad Shack answering machine power supply to get the needed 12VAC center tapped power that the board needs)..