Harmy (presumably the source of your despecialised ROTJ) has also done the whole OT in the same way, including ESB. It's as close to a HD OUT as we currently have.
Adywan's Revisited ESB is still delayed but he did do a different despecialised ESB (I think it was to tie in with the 30th anniversary back in 2010) with a very different colour mix which I enjoyed a lot. It was SD but as you have enjoyed ANH:R so much that shouldn't be a problem.
It's very crisp and bright but I'm not sure how available it still is.
***UPDATE*** here is a link to the Adywan version I was referring to.