2 Player PSP

Hi, I'm going camping in a few months and I wondered if anybody had any suggestions as to being able to play a PSP 2 player. I had a look at this thread: http://www.dcemu.co.uk/vbulletin/showthread.php?t=44583
But did not really find the answers I was looking for. Would there be any way of using an extra controller (or two) on a PSP and also be able to play PSX games 2 player with it?

I would love to play Tekken 3 multi-player when I go :)

Any answers/feedback much appreciated.