DY, The Cohen becomes Taamei through being Maahil, which is a kind of Magga. If he is not being Maahil on the Kever how does he become Tamei through it?
Zdad, Chosid mean someone doing something that is not the Din. Chosid Shotte is someone doing more than the Din requires while losing out what he is required. Yarei Shamayim is someone who follows Halacha, to the T. There is no such title as Yarei Shamayim Shotte, but there is a title as Boor Yerei Chet, which is someone who doesn’t know the Halacha.
Calling something extreme doesn’t make it unnecessary. Besides, if you think about it, many Halachos are extreme, it’s just that you are used to them. Isn’t it extreme to build a Succah and eat (and sleep) there for seven days? You wouldn’t refrain from putting on Tefillin if you are on a 24 hour flight — which can make headlines. Hilchos Nida are really exreme stuff and so is Shabbos.
Those jokes about him having some highly contagious disease, what if they were true? Would it also be extreme or I’m sure you can find some undergraduate doctor that theorized that the low pressure of the cabin will inhibit the bacteria from flowing about.
It’s not like there’s a mitzva to wear a bag. A situation came up where this was the only viable solution. Funny situations bring funnier solutions. What if you were invited to a dinner with the queen and they change seats for every course, so that you get to meat as many peole as possible, but since you keep Kosher and you had to bring along your own dishes you land up walking around the hall carrying dishes? Chillel Hashem or Kiddush Hashem?
There is no Mitzva to carry dishes, but a funny situation came up and tested you. Even though it is embarrassing, you gotta do what you gotta do.