You still need to wait for the diet to do that. Burgundy releases the country with the core on this province. The country saved as pu_hre_country gets the opinion modifier 'Petitioned for Imperial Membership' towards this country for 50 years, worth +50 opinion with a yearly decay of 1. Have government form Daimyo and are subjects of the shogun.
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A temporary claim will expire in 25 years after a nation first gets the claim (permanent claims never expire). The War of Religion in the Empire has ended in total victory for the Emperor and the Imperial Parliament has convened in a Diet to proclaim Protestantism as the sole confessional faith of the Holy Roman Empire. Because roleplay (and Chop Chop) I went Anglican. If the goal of the war is not to seize territory or force-vassalize, then the choice of CB is less important, since extorting money or releasing nations doesn't cause AE.