Jeff,
Before I forget, over the weekend I was installing the shroud kinda following your idea as a reference. I came across something you may want to think about before you go to far. As I was putting the hardware together to mount the fan similar to your nut and bolt idea and I thought what if the fan needs replaced at some time, how is one to get to the nuts on the back of the shroud between the radiator and the shroud without taking the entire thing out. Unless you have a secret flexible rubber wrench in order to get to those, I used nut-zerts in the shroud to run the bolts into instead of nuts. Just something to consider. Once completed you wouldn’t have to take 10 things apart just to get to the four bolts that hold the radiator in that are also used to attach the shroud. Don’t ask me how I know this to be true at least it was in my case.
Michael