What plane did you build? Scratch or kit?

Anything that you would add to strengthen would also add weight.

I figure it you built a plane that needs 1mm sheeting for the LE, then it has to be a small, lightweight plane.

You really shouldn't pick the plane up or carry it by the wing anyway. Stick to surfaces that have a bit more 'built in' strength, like the fuselage just in front of the wing, or just behind the wing. Keep a mental note in your brain not to touch the wing (hard, I know, but you have to disipline yourslfe to it )

You could also do sub-ribs that are under the LE sheeting, but do not extend aft behind the spar. It adds support to the sheeting, but not the weight of full ribs.