V1 could not be less than VMCG
True. However, sometimes the paperwork gives you the non-limited calculation and expects you to apply the over-riding limit .. as in the original post
even if it did, how does that impact on the initial question?
The ferry bit is not the significance .. only that ferries usually involve low TOW (which is)... and low weights generally come up with low V1/VR/V2 schedules .. ie Vmcg/Vmca considerations are not a common problem because we normally are trying to make a buck by carrying payload.