I wonder if Weber would sell you one of the handles from the new models. My guess is that they would only sell it with a door. You'd have to call them. You might also want to call Cajun and see if they have something.
Your other option depends on how handy you are. A trip to a good hardware store would get you all the parts you need to fabricate a handle assembly. You'd have to be creative, but it could be done.