Given the other issues at Garuda I doubt that they have a world leading CRM program in place to help the F/O get through to the Capt let alone guidance on when or how the F/O should take over.
I was in that movie as a junior pilot when the Capt put us in an increadibly dangerous position and I was giving serious consideration to wrestling for control. In the end I did the best to stop us from crashing but short of fighting for control. 15 years on I still don't know if I did the best I could but after many discussions with other pilots I've never had any better suggestions.
At the end of the day the Capt must be held responsible for the safety of their aircraft. And when they have been warned by their crew and the aircraft's safety alerts there is no excuse for deliberately crashing their aircraft.