Enabling of SEP Auto live update if SEPM is not available and Changing of Policies on Client when its ouside the newtork

Hi Guys

in my office most of the time senior managment is out of the country traveling so i want a way to update the clients (LU) Automatically so that when the managment come back to the office my network doesnt have the threat.

furthermore lets just say i had deployed a policy of USB Flash drive blocking and a senior manager is on travel and suddenly he wanted to write something ond USB or DVD so is there a way to change the policy on the system when its not connected to the SEPM?

i really need help on this issue guys. your hel is really appriciated  

P.S : i am using SEPM 12.1.3