The only thing about the Skippy (well, the Carb Options label made by skippy) is the transfats and other junk added to it.

I only have pb in the chocolate peanut butter cup recipe in the treats section so it doesn't matter that it's not sweetened

Like others have suggested, you could always add a bit of splenda and mix it well, or make your own with just peanuts and add some splenda to taste.