Do you think that a HDTV could work? Some have a vga connector. (sorry, the Amiga 1200 can work with a VGA monitor. You would need to have a RGB monior available if you need to go to a different mode in the 15,75 Khz range)
They also have composite(yuk) and s-video con. I wonder if there could be a component cabe made and if a HDTV would work at that frenqency.
I hope this helped.