Al will be. Less than pleased with that, though he will attempt to play nice with Merlin. He'll make it very clear that taking her away is Not An Option, though.

Would Winry like Al to pound Ed on the head a few times? It usually works...

Post-canon Al and Envy are gonna bond, stuck in Inaba together. Al won't allow anything to happen if it will cost him Winry and Ed, though.