I wouldn't use a hole saw. Maybe a sacrificial forstner bit - just don't let Steve know - and only on aluminum and even then it isn't safe. The punch can work to about 1/4" thick aluminum.
Aim to please. There is a lot of crap still coming out of Cuba. The large ring gauge movement is here to stay and long-skinnies aren't being rolled due to needing longer leaf. This year was the first time in a while Cuba had a double growing season. Hopefully in 2019 we will start to see the fruits of those labors.
You can do the same thing with ARC. One (HDMI) cable from TV to receiver and either do the input switching at the TV or receiver. Either remote can be used for volume.