I did. 😁
I'm not worried about heat soak, at the end of the day at high revs when the engine is under maximum load and needs more air that flap is open anyway, and if you are driving rather spiritedly it will be open all the time. Therefore, at low revs, I don't see how that would ever be an issue .
Similar for the ECU, it's no different than having a hi-flow filter in there. I was worried it might throw a warning light, but no, seems totally fine.