I also would be happy to offer my personal Experiences with gaming. I’m 36 and I’ve played games easily for 25 odd years with low vision. Anything I could provide is my direct experiences and analysis on that so nothing formal or professional or overly researched, but if I can help, I would be happy to. Sky, phone call, whatever works. My email is reidentski@hotmail.com.

Otherwise, best of luck for you!

I think you really need to check out places like audiogames.net and maybe talk to people from ablegamers.org. Many of your questions are really missing the mark on what the market is currently like, and it seems like you could use some actual interviews by email or Skype or something to help decide what to ask.
Because at this point it's really hard to fill this out for me, partly because I'm not that in to the mainstream gaming market personally, but also because many of these questions just don't really apply right now or are making assumptions about things that just aren't the case.
I'd be happy to walk you through what I know over Skype or facetime or facebook messenger audio or what ever, but I think the kind of person you probably want most is someone like Ian Hamilton who works with video gaming companies on accessibility, Karen Steven's from EA's accessibility team, or maybe Liam Ervin, Superblindman, or Sightless Kombat who are blind game streamers.

Text fields do not work on mobile and some questions need to be more specific.