To be honest though, they are called broadheads for a reason. If you get a decent hit with, I don't think the pig will offer much of a problem to finish off.
I think you might be over estimating the effect of a broadhead on a game animal. I'm not sure how these pigs compare to warthog (I'm guessing similar) but I've tracked several warthog shot by bowhunters and a lot of those animals kept running for a long way, even ones with heart/lung shots. If it's running at you, you might end up being the one getting hurt. They're big, agressive and they bite. Be carefull.