I'm using a similar setup with an Acer H233H and a Commodore adapter. I've used 2000's, 4000D's and 4000T's.
Since I don't play games, I mainly use it for installation, diagnosing boot problems and for the few apps that don't quite work with RTG.
I did try PAL once and while it worked, it had some vertical lines. I can't guarantee that it was the monitors fault or that it couldn't have been adjusted out though. I just never use PAL, so I didn't really care.
I think HDMI is a pretty good indicator of whether it will work or not, but I doubt it's a guarantee.
Additional info: I have no extra monitors in the drawer. It doesn't flicker, but it's pretty jagged in interlace. It's like a marginal flickerfixer, sort of low resolution as if it's trying to take the flicker out. Very usable for my case, probably not for everyone.
