That all sounds fine in theory but in practice it's not going to make any difference. I've been working on engines and the wiring/electronics under the hoods of my cars & Jeeps since the early 60's and the underhood temps just don't have much of an effect on things. If it did, I'd have installed a lot of hood louvers by now since I tend to keep my vehicles far longer than most people do.
Underhood temps feel hot to us humans but they're shrugged off by pretty much everything else under the hood since manufacturers learned many years ago what holds up to those temps and what doesn't.