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I don't know if Larian would even want to do such a thing. Given that they have had issues with DnD rulesets when making BG3 (Hence all the homebrew they've done) I honestly question if there's actually any part of the DnD ruleset they actually care for and if they simply wanted the rights to BG3 purely for the popularity that comes with its name.
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The question is answered by Swen Vyncke himself in this interview, recently posted on the forum.
https://forums.larian.com/ubbthreads.php?ubb=showflat&Number=944402#Post944402