I wasn't sure what you were trying to achieve. But now that that's clear...
Yeah, his suggestion is correct, you can flip the x and/or y on any CRT the same way. Bob Robert's site explains it in detail IIRC, if you end up needing to do that. I've heard of people wiring this up with a swtich in Jamma cabinets, because there are some games that display the image the reverse of most other games.
TTYL,
Wade