Yeah, It would be easier to have this kind of functionality in a CPLD based device – for this module, what you have is already good. I’d just send O/E out the same as the last schematic, but non-inverted.
On the PCB itself, I’d put thruhole pads / pin header for “non inverted” and “inverted” versions of all the different syncs coming out of LMH1980 if you’ve got the room. That makes it easy for a DIY’er to experiment with the signals. For example, Burst Gate is handy if you’re doing a video input amp/DC restore circuit, and regular (non inverted) versions of VSYNC and HSYNC would be handy if you’re doing a DIY encoder or something.
Another easy extension would be an LED that’s driven from the HD/SD flag, that way you’ve got some kind of format detector on the panel. Not really necessary though.