NTSC is the U.S. video standard. I could be wrong but, you might want to check and see if the on-screen display needs a seperate video cable to work. I had an Onkyo that worked this way.
Or more to the point, they will not be able to do it as an HDTV overlay. There just isn't the available chipset to do it in the price range. Last quote I heard on them, the chips that could do it would cost more than a Lexicon MC-12B.
I think there were some processors that could overlay the OSD via component, but they could only switch interlaced video with component, not progressive or HDTV.