This is interesting. I suspect that Ottokar would have to win the Imperial crown in 1273 in order to hold on to this territory, I don't know if that's plausible or how that would change things. I wonder if Austria would be slavic speaking a few hundred years down the line in this scenario? Carinthia should at least have a larger slavic speaking population. I imagine that Prague would take Viennas place as the capital of Central Europe in this tl.Ottokar II of Bohemia manages to hang onto his Friulian territories.