No it isn't, the proper sidereal action is to be part of the staff, so you should get a set of generic custodian or secretary destinies. Remember, small changes and supporting other people is the sidereal way. Not jumping out in front, since using your charms hurts the destinies you have. (I think it's even a house rule to allow Sidereals to use Sidereal charms without cost while pretending to be Sidereals.)
Also, this. Sidereals don't act on the front line unless they have to.