Hi Paul,
ADV7619 is already used in HDMI test equipment-- but for the protocol analysis. I don't think it's really useful for analog testing as you propose. I don't think you would have enough resolution from playing with EQ settings. It's really up to you though, maybe low resolution and basic stuff is all you are looking for.
It's not something we have pursued though beyond the App note you reference. All the testing referenced there are also baseband video testing as well.
Dave