I think you've already made up your mind to use 20w50. So, just go do it. That's the answer you're looking for right? An approval from some internet entity. Honda couldn't possibly have known what is best for their motors, could they?
I don't know why you need approval. Or, is this just a troll thread?
You don't get much if any oil pressure by "kicking it", the oil is thick, stubborn to move in bearing races, and scrapes away easily off cylinder walls.
All air cooled motors get hot when stationary. Honda sized the cooling fins to keep the oil and engine at proper operating temp while in motion.
I experimented with 20w50 on my 550's. It didn't need it. And was probably bad for it while doing only short trips. I now use 10w40 ear round. They still work!
But, if you ask enough people, you will eventually find someone that thinks 20w50 is better, even if they have no data other than whimsy. Where whimsy is so much better than what Honda knew about their engines.
Do what you want.
