In my opinion naturalness is just as important, if not moreso, than density in getting a good-looking HT. The thin singles in your hairline may be the bane of your existence now, but you might not feel the same way if your hairline had thick 2s and 3s in it, that would stand out to the eye when seen in conjunction with your overall low-density hair.
If I were in your shoes I'd mostly leave the front two rows alone, and look to add density from the 3rd row back. This will make you look reasonably thick, yet natural. You have thinner hair and a bald-spot; a wall-of-hair hairline would look "wrong".