Mac,
I understand your desire to want to try a topical solution, as instinctively it feels like a safe option. But 5ar inhibitors are extremely potent in small doses and they’re absorbed through your skin.
Consider that pregnant women are warned not to even touch Finasteride pills with their hands, as it might cause birth defects.
Mac - If you want an alternative treatment, one safe option that I’m considering trying is topical caffeine. It might not work. But I’d much rather continue balding than to risk touching a 5ar inhibitor again.