The TV broadcasters are very annoying in regards to sub-titles.
They say its very expensive, and even the bbc dont have them on Iplayer or catch-up.
I cant see why, as if you record a programme, to watch later, the sub-titles are still there.
I also dont see the point in having somebody at the right of the screen, giving sign language, on some repeats.
Have you thought about a soundbar, with headphones, as you have a good choice of sound-mixers, to suit different peoples hearing?