I've done something like what you're describing, keeping the good SE changes (like Luke's reunion with Biggs for example) while removing the bad changes like Jabba in Star Wars, Greedo shooting first, Jedi Rocks, Hayden Christensen in ROTJ etc etc with my Semi-Specialised editions of the OT.
I personally feel that quite a few of the SE changes, especially improvements in special effects shots like many of the x-wing shots during the Battle of Yavin, improve the Original Trilogy and therefore should be kept.
You can find all the details of changes kept/removed in these Star Wars OT Semi-Specialised editions in the first post of the thread below:
http://originaltrilogy.com/forum/topic.cfm/kk650s-Star-Wars-Saga-Regraded-and-Semi-Specialized/topic/15637/