In the modern (two part if I remember correctly) television drama of Dr. Zhivago there was a mostly authentic looking Orthodox wedding scene as well as a funeral. I can recall being rather puzzled as to why the groom was standing on the left rather than the right but I don't know enough about Russian tradition to know if this is wrong there as it is in Romania. (I once got dressed down by a babusca for standing on the wrong side of the church in Romania and I guess that pre-communist Russian churches would have been just as traditional about such things as modern Romanian village churches are).
The young fogey,
You are right that Vlad Tepes was born Orthodox and later converted to Roman Catholicism. This was a political move in an attempt to get western help against the Turks. The help never came and he certainly lapsed from Roman Catholicism (he actually nailed hats to the heads of Ppapal representatives at one point!) I believe that he actually died reconciled to the Orthodox Church and he is apparently buried in a Wallachian (Tara Romaneasca) monastery.
You are, however, quite wrong about the 19th century ethnic makeup of Transylvania. The majority of peasants were always Romanian and the majority of aristocrats Hungarian. There were large numbers of Germans but they were by no means the majority and were concentrated in the seven Saxon border towns (such as Brasov) from which the German name for Transylvania (Siebenburgen) derives. In any case, whilst Vlad Tepes, like his cousin Stefan cel Mare, was raised in Transylvania (both were close to the family of Iancu de Hunedoara) after usurpations in their own principalities, Vlad was not Transylvanian but from Tara Romaneasca, which is the province of which he was Voievod.
I've always thought that a great topic for a film (and in some ways similar to your Battle of Kosovo idea) would be the rise of St. Stefan cel Mare and his defence of Moldova against Turkish, Hungarian and Tartar invasions. I actually have started, but I can't see myself finishing it this side of retirement, a historical novel on the subject in which I hope to emphasise the religious aspects as well as the political/military. For that reason I doubt it will ever get a publisher in the west, but who knows?