On my laptop Fn+F12 toggles flight mode in windows. I'd like the same functionality in Linux and am looking for the appropriate X keysym that will invoke the equivalent of rfkill block all when mapped with xmodmap.

I can see there is XF86WLAN and XF86Bluetooth, but they are not what I'm after. I want it to kill/enable all radio devices.

I'm not after the script that would do this (see here for example), but wondering if Ubuntu has this functionality already hooked up and if so, what keysym to set up in xmodmap.