I am not a pro cyclist like yourself but for what it's worth I have seen some thin breathable gear in cycle shops that will act like sunscreen for most of the body without the potentially unknown/harmful chemicals that may be in some sunscreen lotions. I don't know what to do about protecting the face. When I am working in my fields I wear a straw-hat but obviously that would not work for cycling. I believe the safety requirements for children's sunscreen may be different than for adults so maybe that is worth looking into.