The correct answer is "no one knows yet, only that it's different to PnP".
I will mention that a hexblade pact of the blade gets two weapons they can use charisma with, one that they summon and one that they bind to.
Which is exactly what Jeremy Crawford said in the post I linked to.
And isn't really relevant to the original question. It's just a curious wrinkle.
It directly addresses the topic of the thread. It would be hard to imagine something addressing it more directly. The only way you could even remotely say Crawford's post doesn't address the topic is to say "Well, Crawford doesn't say 'You can do it to two light weapons and then dual-wield them'."
The question was "does anyone know how it will work in BG3".
To which the answer is "no" (apart from a few people under NDAs). What JC has to say about the PnP game isn't relevant, since the one thing we do know is it is different in BG3 to how it is in PnP.
