My concern (with this being a viable stand alone job at least) is that, even if this is a rare case where it makes sense to pay someone to transcribe these, whoever is editing this is basically working with all the information and skills relevant (except maybe making context based modifications to subtitles to be more concise or expressive) so it’d be a tough sell to hire someone else to read and comprehend the script and go through every moment of a video after the editing pass just to capture dialog.