What a good explanation, cloudgazer!
There's only one sentence in my book with' whether' and 'to be':
We have a duty to report this whether he be a parishioner or not.
Is 'to be' used here to express subjunctive? What do you think about its formality? Maybe it's used in certain languages, such as the literary one, isn't it?
Is 'whether' used instead of 'if' to express more formality. I always use 'if', but I don't know if 'whether' is more formal or not.
I have also some doubts about your explanation:
Does 'to get a flat' mean 'pinchar una rueda'?
What is a 'donut shop'?
Thanks again for your information, it helps a lot