Yes it is but it does not work
Trivial means very simple.
Serial.print(',,');
Serial.print(Mapped_Aux1);
Serial.print('/');
Serial.print(Mapped_Aux3);
Serial.print('/');
Serial.print(Mapped_Gear);
Serial.print('/');
Serial.print(Mapped_Flaps);
Serial.print('/');
Serial.print(WF_C);
Serial.print('/');
Serial.print(WF_WL);
Serial.print('/');
Serial.print(WF_FUF);
Serial.print( '/');
Serial.print(LG_UD);
Serial.print('/');
Serial.print(LG_Doors);
Serial.print('/');
Serial.print(LG_BOF);
Serial.print('/');
Serial.print(CF_Pos);
Serial.print('/');
Serial.print(CF_AM);
Serial.print('/');
Serial.print(E_Temp);
Serial.print('/');
Serial.print(E_Choke);
Serial.print('/');
Serial.print(E_Imomb);
Serial.print('/');
Serial.print(E_Starter);
Serial.print('/');
Serial.print(C_OC);
Serial.println(',');
Note, though, that the first line won't do what you expect.