I hate to say it but from the photo your donor supply is not very good, at least on the back. There is a very narrow strip of good donor area, and that is why one doctor says you aren't a good candidate. If you were stabilized on finasteride then yes it would be good to do this. If you haven't tried it you can cut pills into 1/4 size and start with a small dose to see how you react. Some people feel little while others get heavy side effects. There is no way to guess, but you don't look overweight so it may not be that bad for you.
You can get blood tests to see what your DHT level is as well. That is why you lose hair.
I think you are at the same tipping point I was. I went on finasteride and have had two hair transplant's and look way better. I did have moderate to heavy side effects but stayed on it and eventually they subsided.