Suggest you refresh up on the effects of hypoxia and previous hypoxia related flights such as Helios 522, Payne Stewart’s Lear Jet, VH-SKC and Kalitta 66.
In those incidents pilots lost consciousness within minutes of the decompression occurring. At MH370's cruise level time of useful consciousness is no more than one minute. Your story relies on pilots being consciousness enough to program an FMC one hour after the decompression event occurred.
If the crew has programmed a diversion to Banda Aceh via VAMPI-MEKAR-NILAM-SANOB-BAC, the autopilot will follow this route, further inputs by the crew are not required for the aircraft to turn south from SANOB to Banda Aceh.
So the crew experienced a decompression, weren't able to use any oxygen as you say the crew bottle ruptured, turned back towards Penang, but almost one hour were programming the FMC to fly a route to an airport to their south west even though radar showed them heading north west?
Suggest you get a pilot's licence then years of experience of an airline pilot before posting your "theories" again.