Further tests done - a mixture of Primatte, Keylight and rotoscoping and so far the first mid shot is looking acceptable.
There is still some sizzling edges going on around actor Rob's hair but not enough to be distracting.
Started on actress Alex's body key - again used Keylight with a KeyChew node and Saphire Edge blur along with a rotoscoped travelling hold out matte. Looks okay so far.
Will need to rotoscope her hands and the iPad - may try Mocha to speed that up. Then it's her head. Going to try Primatte like I did with Rob's along with KeyChew and a lot of edge blur - Keylight providing the hold out matte.
Feels like I am moving in the right direction.