From Reuters —
A new study of more than 5,000 men calls into question the idea that baldness can signal a greater risk of heart disease.
Dr. Eyal Shahar of the University of Arizona in Tucson and colleagues found little difference in the heart attack risk between men with full heads of hair and their balding peers. Hair loss also wasn’t related to thickening of the lining of the carotid arteries, the main vessels that supply blood to the brain. An increase in the lining of these arteries, known as carotid intimal-medial thickness, is a warning sign of atherosclerosis.
The study was published in the American Journal of Epidemiology. To read the rest of the article, check out — Study debunks heart attack-male baldness link.
Glues, tapes, and even clips are methods used to hold down the hairpiece to the scalp, which can cause even more hair loss. These will likely not prevent you from getting a hair transplant in the future, but you’re running a huge risk of causing yourself more trouble with hair loss. Weaves also cause traction alopecia. There is really no way around this. The decision to go with a hairpiece is a more common decision than those that want hair transplants, possibly because of the perceived cost difference and/or the fear of a surgical procedure. The choice may be a very expensive one, however, as the 5 year cost for a hair system can run well over $15,000. See 
Your inferences are correct. First of all, it is wrong of them to suggest that any finasteride spray is proven effective by the FDA. There is no such proof available and certainly no FDA clearance of tests on either the spray by itself or the combination of the two medications (finasteride and minoxidil). Secondly, the site for this Promox product says that it “Contains: Minoxidil 5%, Azelaic Acid 1.5%, Progesterone 0.25%, Tretinoin 0.025%, Finasteride 0.1%” — and if the product indeed has progesterone, it may be absorbed by the body. Safety would be an issue, let alone violations of FDA approved language and claims.