My husband wasn't 100% on board at the beginning but I'd already been doing GC churning for almost two years previously, and he was quite impressed with how that turned out, so he agreed to let me play the CC game a bit. Once he saw that our credit scores were only going up and we weren't taking on debt, he relaxed about it. Now, he is fine with it but I don't share much. He doesn't care for the nitty-gritty details. Basically, he just wants to know which card to use

Oh, and he doesn't want to call the CC company. He's done it when I have asked but he's much happier if I don't ask him to do that.
So, I recommend you start slow, and don't overwhelm him with details or anything you know stresses him out. Let him know it's very easy for one person to manage both spouse accounts so he really needs to do nothing.