Surely just removing Sac-Pac from Zephrys wish-list solves this whole problem?
I mean, nobody runs the actual card in any decks that I know of.
The debate seems to be more about whether that interaction is actually a problem. I personally don't think it is.
Zeph will always be around in Wild. So effectively, Mr. J will never see play there again. That’s not right for a Classic card.
Most Classic cards are weaker than expansion cards. That's how the game has always worked. Yes there are exceptions, but it's totally fine if Jaraxxus isn't one of those exceptions.
If you are dead-set on using this outdated card, you should probably also use some albatross and hope for the best.