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For someone who do not care about Tchalla as a character...
I think Marvel did the best choice. Tchalla never was interesting like that to me, in the movies or in the comics.
I remember people saying that Killmonger was a much more interesting character and that Tchalla was pretty transparent (or a straight sellout).
They needed the right actor, character and characterisation.
Young T'chaka was a compelling Black Panther in the < 10 mins that he was on screen.
CB (on reflection) did a good job, at the end of the day BUT the BP franchise needs a strong lead and at the moment they don't have one. Not even Killmonger. Ayo is probably the strongest acting personality that they have at the mo IMO.
Maybe they focus on Altantis / Wakanda for this movie (much as how IW had thanos as protagonist) and let this movie end with the act that removes the T'Challa character. Then MCU TV+ films until BP3 gives them time to introduce a new character who will later grow into that role (if not position).
Maybe they could tie it in with the multiverse of madness stuff. Maybe the Atlanteans could be to blame.
To allow for an empty throne maybe Wakanda could undergo a civil war (in addition to the problems with Atlantis).