Of course not. I dont know why this is so difficult for all of us to show. There is a certain point every Mass where the people outside of the instruction of the Church do the SAME Gesture every single Mass at the exact same spot.

It isn’t a personal devotion, it isn’t something you do with someone you care about and are at Mass with like your sister, it is something that is expected and done at the same point every Mass. To sell it as ok, or not forbidden by name, or spontaneous is not understanding what is going on. The church dictates the Mass to the people, not the other way around. You of course can hold your sisters hand but if you and every single person in Mass give a giant thumbs up at the consecration EVERY MASS, because you want to show joy and everyone in the parish is doing it ! That would be outside of the bounds. Same here.
If say on 9-12 2001 you were saying the our father at Mass and everyone was weeping then yes go ahead! Hold a hand, but every Mass every day of every week!? That is inserting something into the Mass that doesn’t belong.
Football teams like to show unity and community by slapping each other on the backside.
Do you think this would be appropriate at the Our Father for Masses involving these team members? nope.