AHC actual westphalian state after the Napoleonic Wars

What does need to happen for a westphalian state that is actually in Westphalia? The country needs at least Münster Dortmund and Arnsberg (former duchy of westphalia) and should not own Kassel as the Bonaparte Westphalia did. The capital of this state should be somewhere that is generally considered westphalia and even if this is not a completely defined area it shouldn't be in Hesse or the Rhineland.
Who could rule this country? And what would Prussia get in return for this?
 
I know this is a pretty obscure part of history and germany but is there no one interested in this question?
Is there no prince without a country who needs consolidation?
 
I’ve seen some suggestions where Prussia gets all of Saxony and then the Saxon prince gets the Rhineland/Westphalia as a consolation prize of sorts. That might work.
 
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