It's very simple - if you intend to change the playing characteristics of your golf ball by artificially heating or cooling it, you are breaking the rules. Every single one of your contrived circumstances can be covered and answered by this very plain and common sense explanation.
You cannot wash your ball in warm water if you're doing so to intentionally make the ball go further. You can wash your ball in warm water if you're a normal person doing it because it gets dirt off the ball better. You cannot place your golf balls in a special insulated black sack designed to act like a sauna to heat the balls up. You can place your golf balls in a black sack if it just happens to be what you store your golf balls in.
Golf is a game of honor and intent, and this is no different than the dozens of other rules regarding activities prohibited only if the player intended to gain an advantage. It makes the judgement of the rule very simple for honest golfers, and more difficult for those intent on toeing the line as close as possible so that they can gain an advantage so small as to be nearly unmeasurable. I know which type of golfer I am, and I also know which type of golfer I'd rather play with in a tournament.
That seems reasonable to me. My 7 iron is a 160 club. I carry 9-5 in "traditional" irons. I carry a 3 and a 4 hybrid. 19.5 and 22.5 degree respectively.
BTW - I had to answer neither in the poll. As I carry a 19.5 degree and 22.5 degree hybrid. So I have nothing that fits the 20-22 degree description in the poll.