If you can't find one, you could make one or have someone handy with metal make one. Wouldn't be too hard.
I don't think welding that would hold up for long.
Just find a flat piece of steel roughly the same thickness and same width, drill two holes and bend it a little. Then fashion a handle for it. It doesn't really have to be threaded to accept the handle you have. If nothing else, put a few wraps of tape around your newly fabbed lever for a handle.
It should at least get you going in a pinch.