macos – disable volume control sound effects when holding shift

Most likely the following issue will result in me buying BetterTouchTool, but before doing so, I’m asking if there’s a solution that doesn’t require third-party software.

The issue: I’ve switched the touch bar on my Mac to show the “extended controls”, because that way the volume and brightness controls are always in the same place and don’t require a long-press in order to use them. I also have all user interface sound effects turned off.

However, the volume control ‘pop’ sound effects still happen if I hold down shift while changing the volume. This is really annoying, because I keep touching the volume controls when holding shift to typing symbols on the number key row.

So I’m wondering if there’s a way to turn this feature off. Ideally, I’d like to disable the volume controls entirely when I’m holding shift, but otherwise, just changing the volume silently wouldn’t be too bad.