i really doubt if you can pour anything in the gear stick hole. It's just a solid shaft that goes into the trans AND considering how thick gear oil is, it's not going to seep in.
Pouring the oil in the tailshaft would work, but you would have to lift the back of your car up really high. You can't pour the oil uphill.
What about using a propane torch(plumbers torch) to heat the area around the plug, being carefull not to BBQ your ride.