Some great stuff indeed!
I think that, with a few refinements, the weight one would probably be the one most likely to be believed if it was presented in a believeable manner.
It could be worked into the baptism thing, a bit like not accepting smokers as candidates? A sort of general non-abusing of the body sort of thing such as: Does the candidate for baptism partake of foods or substances that dishonour the physical body (that is owned, BTW, by Jehovah)? Does his physical appearance indicate that he may be prone to gluttony?
Worded correctly, it could wreak havoc! Imagine: "Now then Sister Titwobbler, do you think that you would have been accepted for baptism under todays rules?
Heh heh.
Englishman.