forget the promotion of native amiga screens, only some "good" workbench progs work with that, games don't.
for a cvision/ppc look on eBay and/or place a wanted ad here.
also on amigakit.com there is a VIDEO SWITCHER with a manual flip-switch that allows you to switch between aga and rtg.
or look on eBay for a RARE Multimedia&Design Monitor Switch, that with a little mod and a cgx4 patch turns to an AUTO switch...