Have a user configurable setting to choose which reader to use

[rchrd2]

For example,

One might prefer to use the audio book reader or Mirador, or IA BookReader.

Both audio book reader and Mirador still need token polling, but this should be pretty easy; eg:

setInterval(function(){
    // ajax the token endpoint on archive.org 
}, twoMinutes);

This might require also logging into Archive.org, though. So the login form would need to log you into both open library and archive.org. The accounts are shared, so this could be done with just one login form.