I'm thinking a rectangular base plate, with a clevis block welded to it, bolted to the frame in place of the stock hook, with the stoutest grade of metric hardware available, SHOULD be adaquate in most situations...thoughts?
That would work.

Whenever I finally get my bumpers built they will have attachment points welded on....but until then I have just used the factory tie down holes. I think you would have to be stuck REALLY good to bend those.