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How about just Black Panther: Long Live the King? That way you avoid mentioning death in the title, and at the same time it can still be read as a tribute to Boseman.
How about Black Panther: T'Challa Forever? As a tribute to Chadwick, he will forever be our Black Panther. And also, using "forever" is a call back to your original title as well as a link to the sequel. Sort of like Spider-man and "home".