I know I'm about a year late but hope this helps... I think what you just wrote is the beginning of a great idea! In my opinion I will try and create two stories (from the same character) and then merge them. One being the past of the main character (15 or 16 yo probably) just before he got the accident. And the other one based on the present (probably in his mid 30's or early 40's). So, I'll be showing through the film how we was when he was young (passionate, happy, positive) and how he is now after the accident (angry, discouraged, pessimist) since his dream was destroyed 20 years ago. And while we are showing the today of the character we realize why he became this way... And the character arc will be him transforming into who he once was despite his disability. I would start by showing the present life and then show the past life without being too obvious and at the 10% mark (or inciting incident), showing that the person is the same. Maybe you could then show a love one who he lost because of his change of attitude, reveal the accident, lost close ones, destroying his past works, etc, etc. I think that if the first ten pages work (showing us two great characters [which are the same but different]), people will be very interesting in knowing what happened to him that made him be a complete different person than who he was.
I don't know if I'm making sense at all, I hope what I wrote helps and I hope to read your story or see your story one day! I think it is a great idea. Lots of success!
P.S. I didn't have a nofilmschool account and I just opened it to reply to your comment haha so thank you! I feel like I belong to this community a little more than I did. I also recommend watching the movie "Blue Valentine" which tells two stories, one in the present and one in the past which serves as a guide of what's happening in the present. Happy writing my friend!