There is a handy feature in Windows, when you type Win+. a selector for Emoji and other Unicode characters will appear.

You can install a similar app in Arch Linux using gnome-characters package.

sudo pacman -S gnome-characters

Now you can mimic the Windows feature and assign a global hotkey for Win+. to execute gnome-characters.

Using xinit you can start applications without even starting a window manager. There is a sample in Arch Linxux wiki, but you may notice that Chromium does not fill full screen.

With the example below a specific site is started in kiosk mode taking whole screen. Change the size based on your display.

exec chromium --app=https://example.com --kiosk --window-position=0,0 --window-size=1366,768