It might have been done, however, there migth be 2 problems with doing this.
1. The role of the ac if the Tac Demo is being conducted with live loads, and more importantly,
2. The schedules for the Falcs are usually very tight and to have the aircraft waiting for its Tac Demo slot might cause some Falcs slots to be missed.
However, if they are dropping the Falcs then flying straight into the Tac Demo after the flypast that might work...
WW