How much could I lengthen without looking visibly disproportional or awkward?

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I'm new to this forum but I have been looking into limb lengthening for years now and I have a question. How much could I lengthen my legs before things look awkward? I know that arm span plans a role but right now I am more focused on the upper/lower body ratios before that, as I can lengthen my arms later if the need arises. I don't know how to make a good mock-up so I can't really see what I would look like.

I am 5'4-5'4.5 (163-164 cm)
Sitting height is 34.5 inches (~87.6cm)
Inseam (crotch to floor) is 28 inches (~71cm)

I plan on doing 4-5 inches (10-12 cm) in total, split up between my femur and tibia. I'm only 18 and am about to enter college so I won't get anything done for at least 5 years, but as I'm probably done growing I may as well plan for the future.

What do you guys think? Is 4-5 inches reasonable? Can post a picture of myself if necessary

Edit Post

I think in all likelihood I'll do 4 inches (10cm), as I'm fine with having longer legs. Also, it turns out my forearms are a bit longer than my humerus, about 2 inches. My wingspan is the same as my height, so even if I add 2-3 inches to my humerus it should be within the normal range.

Frankly I'm fine with giving up some of my athletic ability, given I'm not an athlete, although I will do my best at PT and securing an experienced surgeon, like Dr. Assayag or Dr. Rozbruch as they are the closest to me.