I watched the videos and all of them are a lot more of a process than a few screws and a blower brush
Show me otherwise
Ok, you may want a pair of tweezers to deal with the audio wires, but they’re no big deal. Other than that, one screwdriver and a blower is all you need.
https://jamiecollinson.com/blog/disassembling-ricoh-gr-for-sensor-cleaning/
The GR III has no audio wires in the way and requires literally one screwdriver and a blower.
https://www.johnmaguire.me/blog/cleaning-ricoh-sensor-dust/
I’m ham-fisted with shaky hands, and I can comfortably manage both of these processes in around 20 minutes for the GR III and 30 for the GR.