I agree, my current daily driver is a Keychron and so far I haven’t had a problem with the Bluetooth when I use it. I use it wired most of the time but a 2.5Ghz dongle would be fantastic.
I just saw the Royal Kludge RK918 today and it looks just like the out of production Anker keyboard I have. It is solidly built and looks great. The only drawback I see is it appears to be like the Anker in that it is a hardwired cable, no customizing with aviator cable or such. Not all RK keyboard are like this and many have the dongle like yours.
Well how about 98%. Looks the same except a 1/2u space moving the numpad to the right… Keychron K4Pro. I actually carry it back and forth to work so it is my daily driver and I still haven’t quite gotten used to the placement of Del/Home/End. I sort of miss the Insert key, I need to check the mapping and see if it is on or can be added to another layer.