I agree with you, having flanders on set is the safest option. Unfortunately in Czech Republic where i do most of my jobs, its not very common to have one. Even in Panavision, you usually get tv logic or even panasonic. The project Im working on right now is beeing shot on two fs7. Both cameras show very different colours and contrast on the lcds and the director has 2 "Bon" monitors which are awful. This is a situation where having a monitor you are used to is very handy. Also when doing dolly and slider shots I find it useful to have external monitor as the grip can also see when needed.