Inside of a submersible warship really is not the place to be conducting assembly of sensitive electronics, and just because you call it "fast automated" doesn't mean it's either of those enough to be feasible in combat situations.
Right. What's more likely is a box launcher in a shipping container. Both China and the US have prototyped that. Launch from anything that can carry a shipping container. Such as a small, expendable self-propelled barge.
