Orchestra will eat when guests have their main course and the keyboard player will provide soft background music that allows conversation at the dining tables.
It is nice that you are taking into consideration the band’s eating needs. But is a second keyboard player really necessary? Have the orchestra play some prerecorded music (their own or one of the many “relax disks” out there.)
The orchestra doesn’t need the full dinner service to eat either. Give them some time to eat and take care of their needs and get back to doing the job they were hired to do. They can even eat during the chuppa and take a 20 minute break for Marriv during the Simcha.
In my opinion, hiring another player just for the meal is a waste of money.
SiDi™