Why not just use a TV, if you're looking for
TV-ish frame rates? I used
While most modern-ish UK and European TVs have RGB intputs on the SCART
socket, I am told that such a facility is rare on US TVs.
On the other hand, modifying an isolated-chassis TV to have RGB inputs is
probably a lot easier than modifying an SVGA monitor to do TV scan rates.
-tony