Shared combat systems for a hypothetical AUKUS destroyer

How could an AUKUS destroyer meet several countries' different requirements?

The suggested approach shares sensors, missiles, VLS, and command systems while leaving hulls and engines to each nation.

The hypothetical project starts with British, American, and Australian requirements, with Japan suggested as another possible partner. The proposed cooperation would cover sensors, missiles, vertical launchers, and command systems. Each country would choose its own hull and engines, including a larger ship or more missiles where needed. The reasoning is that the combat systems are the expensive elements to research.