Rigoletto,
From your description I guess it is some salvage business or ships main engine repair work your crew is doing?
If the luxury is not an issue, You might want to look into renovated S61(T) as well.
by Carson’s/Cobham
new laminated rotor blades, glass cockpit.
large cargo door etc.
When you want to scramble a crew for unprepared take-off you will be surprised how much time it will take to scramble aircraft crew and prepare flight plan. Locations to land nearby your destination will also be limited to airports if you can not ask for permissions for off-airport landing well in advance.
I assume you will not want to employ multiple pilots on stand-by?
Who is going to man, manage and maintain the aircraft?
Perhaps better to get a (local?) helicopter company involved to see what they can contribute to your business case?