That is an interesting twist, the bit about characters wanting their ability back but realizing they won’t. I do think some disabled individuals might feel they don’t identify with that if they face it upfront though and only find out later that it was not the game’s intention. To get a good impression going from the start, perhaps some characters could have different opinions about it - and we might not even talk about goals like defeating the enemy or getting sight back until the 2nd or 3rd day in the game. But when we do, if one character wants it but the other thinks that’s the wrong way to approach it, creating friction and disagreement, the player will be able to identify with at least one of the perspectives. But I wouldn’t make them sound wrong. I would make them sound fair. Because people might even identify more with one on some day, but more with the other another day.
Example: Dude: I wonder if our friend Pell will ever find a spell to get me my arm back. Gal: Oh, that would be wonderful. Dude: I hope he can find a way to get your [I forgot] back, too. Gal: Oh! Thank you. Dude: [keeps rambling] Gal (hesitating): Well, I really appreciate your kind words. Dude: It’s no worries at all. I can imagine how hard it is for you. Gal (hesitating): Oh. Yes, it is difficult. But I have been learning how to do things differently. I think… for me, there are other things that matter more to me than regaining my [whatever]. Dude: Oh! Really? Gal: Yeah. How about you, Pell? How do you feel about your sight?
then Pell can state their opinion, which lets the player choose their own vision.
Which doesn’t mean he’ll get the vision back in the end. Or if he has that chance… maybe the outcome isn’t what people expected.
On the other hand, these are only rambles from a sighted person here. I think you’d benefit a lot from gathering experiences from people who became disabled from an accident or something, to understand how they felt when they were still re-learning the world, because they will have the lived experienced that is similar to the characters in your game. And this might enrich the writing and narrative.