Why can't they come out with pianos with shorter legs on a grand and different height sizes for upright for short people?
Have you ever wonder are pianos for short people?
https://www.balancedpianist.com/bpseatingguide.htm
This is what my daugter uses to sit properly. The foot board was easily made and will be adjusted accordingly to her growth velocity. She would not be able to press on the foot pedals though. We also have an adjustable height chair.