Hi krispy
the best option for a video projector, is an
Amiga scandoubler-flickerfixer (forget to achieve a decent picture, from a A520 module with a video proj.).
Check if your video proj., can sync from 31 Khz at least and search for a external scandoubler-flickerfixer.
There are also, "RGB+CompSync(analogic) -> Y-C" but . . .
Ciao