You should create a "saved message"and send it manually upon a confirmed reservation.
Both your husband and you can download airbnb app and you will get the same notices, respond when the other person is delaying. We sign our name on the bottom of each message, that way at least we know who answered what. In alternative, your husband can create a profile, and you invite him through your listing to be a co-host.
No, you cannot split your traveler and hosting profile, it'll be visible to future hosts that you are also a host. Your husband can create his own profile and just use that one for traveling.