Any info on how they're planning to do compounding?

I definitely could see them just saying no to it. Bondsmiths aren't an option, and neither are compounders. A less useful feurchemical trait with a very expensive metal, say, electrum, wouldn't be too op, but otherwise, I think they'd just have to artificially nerve it in a non canon way. Personally, I'm good with the Bondsmith method.