Oops, I just realized you have a hi-res/31khz/VGA only capable monitor in that Naomi cab.
In that case, you would set your video resolution to 640x480 and just connect video and audio right up to the cab. You might need an RCA-to-3.5mm adapter for audio. You can go with JVSPAC, but it is a more expensive solution that offers more simpler wiring. Or you can crimp a pair of USB controllers and to wire them up under your control panel. Costs a lot less, but also requires you do have the requisite parts and tools for the job, plus is more work.
Save the JAMMAizer for when you have a JAMMA/standard res cab or a tri-sych capable cab.