How about nuts? I love macadamias. They may be expensive, but you only need a few to be satisfied. Or pork rinds (bacon puffs)? I think there are recipes here for protein bars that you make yourself so you KNOW what is in them. Check out the Recipe section.

I think the laxative effect of the sugar alcohols is mostly in the 'candy bar substitutes'. It's hard to eat just part of one of those, but a serving is only a few squares. So if you do it, stay near a bathroom the next day.