This won't work if you don't have your own welder, but you could weld a nut or bolt to the drain plug head. Don't get too much heat into the aluminum, and let it cool down close to ambient temperature before removing the plug - aluminum threads are known for breaking loose and spinning out with the plug when hot.
I meant to mention earlier that if you remove the pan (sounds like you won't), look for a steel ball and spring rolling around. They are parts of a check valve/flow restrictor inside the oil cooler return line and have been known to break loose.
'98 LXi - Later Concorde gages (black w/ chrome rings)/'99 LX - LHS gages (white) - HIR bulbs