SoRCon 11 23-25 Feb 2018 Basildon UK http://www.sorcon.co.uk
This also works if you have 4 cards in hand, as long as one of them can be played during the Leadership phase. Play one, decline and discard the other three.
Leadership cards that allow you to discard cards can make this work with even more cards in hand.
In fact I think one of the very earliest FAQ list questions was what if the leadership card and discard leaves you without the 1 to 3 cards you normally need to discard when declining to start a fight. (Answer, you can discard 0, but only if 0 is all you have.)