Having fucked my sled trying to find a safe way I’d say go with recommended Propecia dose and see what happens. If you can’t walk because your balls look like grapefruits and your semen a water spritzer, quit and try topical. But to be honest two years high dose topical... doesn’t do anything.
This is the common story around here. People notice hair loss, and come here to find out what they can do to stop it. They read horror stories about side effects, and they try to find any way they can to avoid side effects instead of doing anything they can to fix the problem they came here to solve in the first place. Instead of avoiding sides the only thing they end up avoiding is fixing their hair.