Thoughts on non-existent arrowheads recipes

Fire Arrowhead = Arrowhead + Cloth Scraps (auto-lit on fire?)

Smokescreen Arrowhead = Fire Arrowhead + Cloth Scraps (for more smoke?)

Water Arrowhead = Water Arrowheads do not exist in game

Freezing Arrowhead = Water Arrowhead + Essence of Air (too expensive?)