Aesthetically you will look fine with 7cm on tibias. Also yes it is a feasible length and if you lengthen slowly and stand a lot (to avoid equinus) you'll probably be ok.
But your biomechanics will be ruined so if you want to run, play sports and all these then with 7cm you won't be able to do it, simple as that.
You will walk fine, you would do all normal things but nothing more than that in a level close to before LL.
Personally I don't care at all because at my initial height, gaining 7,5cm and reaching a solid 1.76 (morning height) was much more important than having much better athletic abilities and be 1.74. I only lifted after all, which I still do in a very good level (better than at least 95% of men even younger than me) so I never cared about running for distamces, olayng football and things like that.
That said, at your height I wouldn't push it that much because even with 5.5 cm I would have had an almost perfect height and much better athletic abilities compared to 7cm. So it doesn't worth it imo at your initial height. Go to 5.5cm and consider yourself done. 1.81 with 1.83 has no real difference but not able to run fast or for distances has.