You can ask anyone who has been programming for 40 years or so this same question. Before we had visual editors [but after we stopped using punch-cards], we had line editors, which worked under fundamentally the same constraints as programming blind has: only a little bit of content at a time, streamed, selected before "display", and requiring a "replay" after any edits to see if the edits were correct. A description of a working day for a grizzled ed(1) veteran would probably have a lot in common with an optimal blind-programming experience.
I suspect coding blind with an audio interface is closer to a word-editor than a line-editor. Imagine your monitor showed only one word on it, or one punctuation mark, and you had to remember everything else!
(Edit: I see below there are Braille editors, which I imagine mirror line editors! Expensive though.)
