I honestly think it doesn't make sense to not simply lengthen to whatever your desire height is. I understanding not wanting to lengthen too much to increase recovery outcome, but other people's reactions are so brief and minimal. No one really knows LL is a thing, no one really considers it too hard. Your answers/excuses don't have to make sense. You can say you corrected your posture, corrected bow leg etc.
Reality is if you look healthy and you look better, family won't press too hard as long as you have some semblance of an explanation if they even bring it up. It's 50/50 whether anyone will even say anything. You will be shocked at how unobservant the vast majority of people are. I had shoes made with custom lifts years ago that add about 2.5 inches to height, and no one said anything except one comment that I looked like I had lost a lot of weight/looked slimmer. Within the parameters of safety, how your family reacts will be more about your dynamic with them so if they are going to notice at 2 inches they are going to notice at 3 or 4. Just say while you were studying interstate you thought it would be a good opportunity to correct bow leg so you wore the brace and it added a bit of height.
I think the only downside to people knowing is cosmetic operations generally are viewed negatively/as seen as frivolous so you want to have some non-cosmetic BS reason there is a slight change. But don't limit your LL just because you think an extra inch is the difference between no one saying anything at all and interrogating you about it because it won't be.