Better, he can deceive the commander but not force him, never the less, tricking him wouldn't be easy. Aizen doesn't know the conditions under which captain comm will be required to open the gate, and just not anyone can tell him to open the soul kingdom. Who will aizen pretend to be? Zero squad? no, they already have the key and if he had met any of them they may have changed appearance since they left soul society e.g the fat woman.
He doesnt even know the key is their bone(probably the same for the commander) so he might say bring th key, and the commander will immediately become suspicious.