BuzzBox
So if you can’t make a radio call, turning on your cell phone would be an option.
Diverting at 10,000 feet is very fuel inefficient, the default LRC speed for the B777 is Mach 0.84
With only 2 screens available, it is going to add complexity to the situation. Running a checklist on the R INBD DU, will mean the Engine and Crew Alert Display is not visible, items can be missed.
Yes, flying along the Malay/Thai border is not a concern in a emergency diversion to Penang. The standard route is along the border from Kota Bharu to Penang. Just like MH6163 flew 30 minutes later.
A pilot suffering from hypoxia at Penang would make irrational decisions, such as divert to Banda Aceh.