Some thoughts ..
(a) increasing V1 to Vmcg,
.. but check for ASDR conflict (generally not likely to be a problem for a ferry)
(b) Vr to the new V1 and
ought not to be a problem
(c) keep V2?
Vr to V2 usually involves a time delay associated with the rotation flare speed increase ie it would be usual to see a V2 exceedance.