Dear...,
in the following lines I will answer your question whether Germans would like to have a king or queen too.
Germans are fascinated by the British royals, because they're a cultural eye-catcher.
They have a special relation, which is intensively close to their nation.
So the British are proud of Queen Elizabeth II and her family.
Therefore German envy them, because in their country they only can be proud of local attractions like the "Kölner Dom", but that doesn't concern the whole nation.
They also like the fabulous idea of a real prince and princess.
Therefore 'Royal Wedding' is a fantastic event, where guests are dressed chic, wearing great uniforms or kilts.
Due to the English 'Pomp and Circumstance' no other country could stage public spectacles better than Great Britain.
In general German admire the British aristocracy and the way the Royals live with all their tradition and rituals.
I hope I could answer your question. See you