1) I'd suggest you respect the MEA/MORA. It's not without a reason higher than 10.000 feet...
On the other hand there are only very few places with extended areas of HIGH MEAs. Normaly you turn to flat terrain once you realise your pressurisation problem and you are there in max 10 Minutes. During this time the pax are on oxygen, so no problem.
Where this is not the case, the aircraft has to be fitted with modified oxygen systems and special 'escape routes' are calculated (hindukush region for example).
2) By selecting RAM Air On. If the delta p is below 1 psi the check-valve will open. RAM Air only helps to ventilate the cabin, it's not good for any kind of pressurisation.
3) If you keep the aircraft altitude and thus the cabin below 14.000 feet you could continue. Where to? Destination? Hardly.... Your Passengers would be pretty frozen up pretty good and your fuel will hardly be sufficient...
Regards, MAX