GertrudeBElion
I think the use of Edelweiss was a nod to the fact that Kai played one of the middle Von Trapp children (Rolf) in the 1965 original The Sound Of Music
Except Rolf wasn’t one of the Von Trapp children, he was the blond delivery boy turned Nazi who danced around the bandstand with the oldest girl at the start and blew the whistle when the family were hiding from the Nazis at the end (yes, I know... I’ve seen TSOM far too many times)