Well ... the 'Crown Prince' being liked by the populace ... wonder where this comes from. During Nazi-times he was an at some times used/abused celebrity for show.
That's all he was : a celebrity, like Lettow-Vorbeck, Mackensen, Trotha and several other ex-imperial high-aboves.
Pre-Hitler he actually WAS pre-offered to become candidate for the presidency but ... daddy did not approve and lil' Wilhelm III. had the non-existent balls to nicely follow suit (put simply : he was quite sume dud(e) with his overruling 'thinking' membrum below his belt).
Ex-Kaiser Bill would NOT approve any Hiohenzollern to become some figure of the the republican German Empire (the term "Weimar Republic" was never an official name and contemporarly used only to offend the existing political system).
Something I doubt Wilhelm II would change at any point.
Therefore you would need a Hohenzollern to actually have the balls not caring about disinheritance by Kaiser Bill who was the acting juridical head-of-house Hohenzollern.
Or ... changing Germany back to an 'official' monarchy, 'offering' the House Hohenzollern it rightful crown back. ... IMHO the only way Kaiser Bill would have accepted any member of his house becomming the monarchical head of Germany again.
... or look for someone completly different I doubt you would find enough support(ers) for.