In assuming you are not using your keyboard to set brightness because it’s an external display plugged into a laptop? Search for a DDC application for your desktop, it’s amazing, the brightness controls of your laptop will then control the external display as well. I use lunar on my MacBook, it was a revelation.
That’s not the problem. Analog dials were still easier and more convenient. I’m talking CRT days. Like these: https://i.ebayimg.com/images/g/M9cAAOSwrt5ncwpj/s-l1600.jpg
You could probably program keypad knobs like these to do the same: https://m.media-amazon.com/images/I/71s7PGYBkkL._AC_SL1500_....
Or switch to HDR if you have a capable display.
I was pleasantly surprised that HDR also means you can control brightness - it is all software I that case!
And the brightness keys on an external Apple keyboard work.
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> In assuming you are not using your keyboard to set brightness
I prefer buttons on the monitor.
Using a game comtroller to change brightness is like driving a car from the back seat.