Wings limit I can only go to 6cm, 166.5cm I may still have psychological barriers.
These limits are bs.
If you want to be ok with your height go for 6.5 cm in femurs and 5.5 in tibias.
If things go well you'll look fine and you'll be average in your country.
Otherwise don't do anything. 6cm only will help you initially but after 1-2 years you'll still be frustrated with your height. You can do it and see, maybe you will be ok with that but imo you'll probably not.
So do 2 LL's or stay as you are. The money you have are ok.
Humerus lengthening is a joke, of course you don't need it.