I was thinking about that, but I think I have a solution. I have kind of copied the ideas in this thread to come up with a solution. I had never thought about removing the threaded inserts and using the channel between the bracket and the core.
I have a couple of slant 6 shrouds. I took one and turned it upside down (offsets are opposite between /6 and v8) and it looked pretty close. I hacked the sides of the shroud up pretty good to get it to fit in the channel, but it fits really nice and the hacking is mostly hid by the channel aluminum. The gap on the top is small, the bottom is a little bigger. They will fill with weather stripping like yours. All I have to do is figure out how to secure it. It fits tight enough that it won’t come out, but it still can move around a little.
I will post some pictures tomorrow when I get back at it.