First the corrections. (Sorry I have been going through an adrenal crash - though I'm way recovering - with resulting brain fog.) I said stegosaurus horns above. I meant to say triceratops. In regard to your concern over acidty in lemons - I have done many informal checks on my own urine and have found the results consistent with what others are reporting. Anytime I am getting acidic readings, all I have to do is take some lemon juice (grapefruit works well too) and I will go in the green/alkaline area within an hour or two.
As to my Q., since you have done a lot of research. What do you think about more natural forms of Vitamin C as in products like Alive! C, and in Camu Camu? You have to take more of them to get the same results and they don't say ascorbic C on the containers, just C from fruits.