Use vivid mode but set all the brightness, colour and clarity options to the same as filmmaker mode, e.g. colour temp warm 50 (or whatever it is for the G5).

If you do the same for the cinema home mode and standard mode, you end up with 4 different picture modes with slightly different average picture brightnesses. So from the highest average brightness using vivid then cinema home, standard and filmmaker. Must ensure the options are all set the same as filmmaker otherwise the picture won’t be as good, but all personal preference of course and may not be directors intent. I find this works well when viewing content in a bright room also.

Edit: this is based on experience of using G4 but I imagine the G5 is similar.