Thanks Chaps
CGs link provided a succint summary.
"It is important to remember that at certain altitudes the aircraft will actually stall prior to reaching Vmca. As a result, it is critical to recover at the first sign of a stall since the simultaneous occurrence of a stall and Vmca loss of directional control could easily lead to a spin."
This confirms my suspicions, twins like this have their very own, additional, coffin corner. Recovery, when it diverges from controlled flight, appears however to be relatively straightforward - shut both throttles, recover the (now) glider, pitch for Vmca+, increase power on good engine and climb away, hoping you haven't met Terry Firma on the way.
Cheers
