Someone in Japan has been fairly clever and done a version of the new episodes using the audio from the original series. There are no subtitles that I am aware since the audio and visual are not actually the same scene each time, but closest match in many cases.
2012 version using the audio from the 1974 Episode 1.
Of course this means that only scenes that match the video are used and only scenes there is audio for are used. Thus some parts of the episode (in both directions) is absent. But it is a fair effort.
Plus he's done it wiith Episode 2 as well.
Spoiler for Episode 2 spoilers:
The avalible audio from the 1974 Episode 2
The avalible audio from the 1974 Episode 3