Prevent Hosts from accessing recordings/meeting information

Other than predefining the individual as a Participant (or not pre-defining their role in the room), I don't believe there is a method to limit their access to the room and it's configuration. Predefining them as a Presenter will limit them from making changes in the room, but a clever individual will figure out they can promote themselves to Host in the back end.

As to recordings, you can move the recordings to the Content Library, and then manage the permissions for access like any other content object. The access would not be tied to the membership of the Meeting Host group, unless you defined it as such. When recordings live in the Recordings section for the meeting room, they are tied to the permissions for the meeting room, so individuals with predefined access to the room (at any level, Participant. Presenter or Host) will be able to view the recordings.