I sing in a small men’s choir, and we do only Gregorian chant. We rotate around various churches. Sometimes we’re seated in pews in an area set aside for the choir, and that have kneelers, if so we kneel. If not we stand through the consecration. In our part of the world, it is customary to kneel at consecration, but stand at the memorial acclamation and amen. Some of our group are fairly elderly, and expecting them to go down all the way to a hard floor (and then get up again) is asking a bit much.
I know many older monks do so but they have their choir stall to help propel themselves back up
So for us bowing is a more appropriate gesture.
It is one of these things where the “spirit” matters more than the “letter”, and where as we get older we need to face our infirmities with humility and realize that we can’t always be perfect in our observances because of them.