Problem is, even though conc. NaOH will attack proteins and fats, pig skin is very dry tough keratin, and the fat is very hydrophobic, and the NaOH only works well with water. If you wanted to dissolve muscle, that would work fine, over time, but the bugs are handling that for you. But to attack any animal skin, you'll need to boil it in liquid. More so really tough skins, like pig or cow, the sort that we use to make leather, precisely because they're so thick and tough.