1 at this point, yes. It appears we won't see T'Chadwicks T'Challa anymore in the MCU. If we got a version more similar to Priests I would be okay with that. Say the variant lost his father the same time Erik lost his and was forced to grow up faster and take over as king much younger.
2. No. Thing with Kasper was that he was created to appeal to white audiences by having a "light" toned character or vin diesel style character take over. Frankly that would seem like the same thing. Instead of having a Powerful Black male, they go with a more palatable light toned character to rule an African nation. In peoples eyes the closest they can get to white without pulling a Tarzan