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OK, just thinking off the top of my head. For the valve cover, maybe mold some aluminum foil over the parts you want to insulate, then spray on a layer of "Great Stuff". They have a variety of this that is called "Fireblock". I think this stands more heat than the regular stuff. Make sure you don't get it on other stuff in your engine compartment, and that it doesn't expand too much. Given plenty of time to cure, you should then have an easily removable insulating shell!
( I haven't tried this, and bear no responsibility for your own experimentation. But give it a try and let me know how it works, and then I might be next!)
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