Way too many variables there I think. Plenty of AAIB reports and such of experienced captains not coming home. If the CP deems a captain a safe pair of hands to fly a new type then that should suffice..all other things considered. Additional experience will come then in the aircraft rather than any captaincy skills. I imagine not many companies can afford to give their captains too much non-revenue flying to build up new type hours before going on line.