the late Emperor’s son, HIH Karl von Habsburg
Don't you mean Otto? I believe he is now retired from the European Parliament. I saw him with many other royals at the mass yesterday on EWTN. Karl, 43, is Otto's son and the Emperor's grandson and eventual heir.
Incidentally, I suspect that many Austrians who do not identify themselves ideologically as monarchists would nevertheless welcome or at least not object to a restoration of the monarchy. A royalist friend once told me that when he was travelling in Austria, he dared to say to a tourism official, "you have a beautiful country....pity that it's a republic," and the official agreed. This summer, at a music festival in Switzerland I met two Austrian brothers who, when I told them of my interest, expressed their immense respect and admiration for Archduke Otto and said that they wouldn't mind having a monarchy again.