BTW, I never mentioned prayers for the deceased, a practice to be found equally in Protestantism, Orthodoxy, and Catholicism.

Yes, you are spot on, we can and should do the same thing vis-a-vis Orthodoxy, although we can and could do both simultaneously. 

Dropping the filioque would be a VERY VERY good starting point. Jay, I applaud you for you openness to such a dramatic gesture, since it does have major implications for Trinitarian doctrine. The whole point of the addition, as best my tired old neurons can recall, is to insist on the Augustinian approach and deny the Cappadocian approach. Bravo! (Perhaps you will now have to burn your membership card as a Traditionalist Catholic, for that bunch is not likely to tolerate a rabid progressives like you for long!)    ;-}