There are no stand-alone WOF games that will work on a G23 without adding the top wheel and a specially programmed com board, and if a dealer has those, they would sell the machine, not the parts for $10K.
The other games may be around. I'm not a poker fan. CSI requires the discrete video card E4690, otherwise the game play is soo slow that it is unplayable. Also the top screen would display sideways on a standard G23 cabinet.
Also certain games cannot exist on a multigame environment, so you need to be careful what you install with your existing games.