

I would argue no one could choose one. A lingua franca is silently agreed upon over long periods of time. No committee sat down to make old Frankish the language of trade, modern French the language of diplomacy, and nowadays English the language of internet arguments.
If I had a magic wand though my vote is Klingon as well. Qa’plah.
I would say for 3 out of 5 recipes extending the time will probably work but you’ll need to eyeball and needle/poke it. But if the recipe relies on the baked good to form a crust at this higher temperature, the result will probably not be as good. That’s more crucial with bread. Test it before you invite people over.