Fair assessment, but I also think the main reason they want to disassociate the DCU from the DCEU is mainly due to that toxic fanbase. Gunn has shown that he's not afraid to reuse actors from previous iterations by keeping Viola Davis and recasting Mamoa as Lobo. Cavill unfortunately just has some of the most passionate Snyder fans associated with him. Not saying they still would've gone with Cavill for Jor-El but just saying that it's an obvious choice, as with any other Superman actor still alive, but moreso Cavill since he shares a resemblance with Corenswet.
If he were about 15 years younger that'd be dope.
Realistically I'd like to see Tom Cruise, Brendan Fraser, Michael Fassbender, or Jon Hamm if the big name rumor is true. Nicholas Cage would be a fun cameo but would probably be too distracting and he looks nothing like David.