The earlier mentioned “Christus Rex” crucifix is a bit different from the normal risen Christ crucifix. While, I have rarely seen “Risen Christ” crosses in older churches, the Christus Rex seems to be more common, but usually in the sacristy.
The “Christus Rex” usually is shown wearing a crown and vested in a Chasuble and stole for mass. In older churches he also usually shown wearing a maniple and I have even seen one with a dalmatic under the chasuble (so in that case Christ is vested as bishop would be at solemn mass).
A “Christus Rex” cross was hanging in the small sacristy of the church I formally attended (it was built in the 1920s) and there is also one in the sacristy of the Cathedral I currently attend (renovated in the 1950s).
So, while the “Risen Christ” cross may not be a part of tradition (I would, however, never deny the family the right to use it on a casket at a wake), the “Christus Rex” cross is part of our tradition. Its common place in Sacristy’s makes sense, as the priest vesting would look upon Christ vested as well. A great reminder of the supreme importance of the mass.