I live in an area with a fairly large number of eastern schismatic churches (Greek, Russian, Coptic). As it has ever been the teaching of the Church that these schismatics have valid Sacraments, it follows that Our Lord really is present in such places in the Blessed Sacrament. For that reason, I make the Sign of the Cross and utter the traditional prayer "O Sacrament most holy, o Sacrament divine, all praise and all thanksgiving be every moment Thine" when I pass these churches.
But I wonder if there was ever any proscription against making this public reverence due to the confusion and scandal it could cause (i.e. leading others to infer a legitimizing of schismatics where none was intended). Does anyone know what the Church traditionally taught about this one way or the other?
I suppose an extension of this would be the proper conduct of a Catholic if introduced to a schismatic bishop - how would one simultaneously acknowledge the validity of his episcopacy but the illegitimacy of his claim to authority? Kissing his ring is presumably not to be done, but what about addressing him as "Your Excellency?"
I thank you in advance for your responses.