What a perfectly OSR idea; to "fix" a lame-a$$ old module. I have several JG adventures that I wrote off decades ago, but are still taking space in the top of the closet. Maybe, I should give them a second look next time I want something to do. Will you run F'dech Fo's Tomb for a group, do you think?
The last paragraph of your post is spot on. And, yes, that cover IS totally metal. I'd buy it.