Remains to be seen, of course, if Karl of Württemberg is gonna last longer than Otto of Bavaria did OTL and leave Greece the way he came "on a British warship" or establish a lasting dynasty (that hopefully may endure less troubles than the Glyksborgs). Though if I may ask, why Karl specifically? He was something like the sixth son of Friedrich II, surely taking one of his older brothers like from Eugen or Wilhelm would equally mean that no union between Württemberg and Greece happens?