If the shocks are off, you can get a large crescent on one side and your socket with torque wrench on the other. Before I had 2 36mm sockets, I put a cheater pipe on a crescent wrench to make it long enough to hold from the opposite side of the bike. It was basically pointed straight up. Hold that with one hand while you torque the nut with the other. Works in a pinch.

 

This is what I plan on doing. I completely forgot about the 36mm in the tool bag. Going to use a piece of pipe to hold it.