I got a Logitech G series wireless mouse and I am super happy with it. I also have my gaming system set up with my TV as a gaming/media set up. When enjoying media, I simply turn off my mouse, so that the light no longer offends. I had to install software to control the RGB lighting on the mouse. I know that’s not what you want, but unfortunately when you are looking at anything “gaming” that is the price you pay.
The day that I went to build my gaming rig, pre GPU drought, when I told the sales guy that I didn’t want any RGB lighting on my system, his look of surprise screamed at me “why would anyone want to do that?!!”. I think that you and I are in a minority of more casual gamers that would prefer to keep the unicorn vomit off our gaming systems.
So I am not suggesting looking for a non-gaming mouse with switchable DPI, but rather allowing a program on your system to change the RGB. The software that I installed on my system (also Piper) for my logitech gear ran once, so I could turn down the rainbow theater, and it doesn’t use any system resources unless I were to start it up again. It’s a small program too, so hardly uses any HDD. It’s not a perfect solution, but I think it’s the closest IMHO.