Having flown Dakar through south america I got the impression that:
no twin would do the job
Need B3 to handle filming missions
We used B407 for HEMS and did fine
Hard job although very amusing
One company had the whole contract
helicopters get really beaten (you get to practice brownouts!!!)
Crossing the Andes at 18K it was quite an experince ...
All in all, a great time that you wish to repeat every year
