hohenzollern britain

So I'm planning a TL in which the Hohenzollerns inherit the HRE in the 15th Century and have Cadet Branches ruling Britain and Iberia. So the timeline of events is the following Friederich II of Brandenburg marries Hedwig Jagiellon (she's born as a twin to a surviving son of Wladyslaw II...

Asking this question to my few friends, they haven't really given me good or at least satisfactory answers as of yet, mainly as a Timeline of events - So A while ago, I was talking about Karl Emil von Hohenzollern, Electoral Prince of Brandenburg and how he was apparently planned to marry Maria...