Its just my opinion that its not a good idea.
There are so many variables that could make it safe or not.
Unfortunately modern NATS is different to days when one minute you've got your feet up, bored and wondering who's going to make a brew! And then on the other hand saying to the boss " you better call up the troops, we will need them tonight. I've got 1 inbound due in half an hour".
There won't be any extra staff. If a safety case is proven by the regulator and it gets implemented into the contract with the airport authority the staff won't be there.
All this will do is add to the stress of frontline ATCO's, decrease ATSA numbers (further) and possibly decrease the service to the airliners, but alas, we won't be bored or suffer any tedious night duties!