I used a coping saw to clean up the broken nubs on the left headlight in the corner where the mount for the under-light trim strip used to be, then to remove the matching piece from the donor headlight assembly. I started gluing this to the headlight using my favorite: Shoe Goo. It'll take awhile to finish this repair, as I can't put all the necessary glue in place at once. I used cyanoacrylate glue and accelerant to tack the piece in place, then started potting.
I also did exactly the same thing to the broken under-light trim strip, cutting the necessary mounting tab off of the donor strip. This is also gluing up, and will take a session or two more to finish gluing. I had a closer look at the electric fan clutch, and found that it probably won't work for me. It's a little deeper, the fan itself is definitely smaller, and the water pump appears to have a mount for the clutch on it that isn't there on mine. So, it won't fit, won't cool, and requires substantial disassembly to put it on. Nah! That still leaves me with two viable (?) options. -- Jim