While admittedly I am definitely not a gamer, you should look into the Keychron keyboards.
They have various models, all of which can be used both wired and wirelessly via Bluetooth. They have a variety of Gateron switch options and some of the models have optical switch options as well.
Their keyboards ship configured with Mac keycaps; Keychron includes Windows replacement keycaps for the handful of keys that need it (Windows, alt, Cortana) and a keycap replacement tool. There are two physical switches: A.) Bluetooth-OFF-Cable and B.) Windows/Android-Mac.
One can switch between three different Bluetooth pairings via a couple of keystrokes.
I have two of their Keychron K1 keyboards and when they release it, I will likely buy their upcoming K8 keyboard. These are the best keyboards I've used since the mid-Nineties era SGI keyboard (ALPS mechanical switches) and the IBM Selectric typewriter (the gold standard of all electric keyboards) way back when dinosaurs roamed the earth.
While I bought the Keychron models with white backlight, they also sell RGB backlit keyboards with all of the seizure-inducing disco effects.
Sorry I do not know if they ship to Denmark.