Till 1559 was Utrecht very big part of the lowlands:
[img]https://upload.wikimedia.org/wikipedia/commons/thumb/b/be/Low_Countries_Medieval_Dioceses-NL.png/640px-Low_Countries_Medieval_Dioceses-NL.png/[img]
All of the lowlands were part of the empire, so if you dont want to have Phillips or Charles to lead, I guess you'll hae to go with an bishop of Utrecht, as they had only the king above them..