I don't have a confirmed answer for this, but maybe an idea. I would look into macro recording and playback applications. Get one that is free or has a trial in case it doesn't work. See if it can capture the keystroke combinations for the Fn keys and then bind them to something like CTRL+SHIFT+[KEY] so that they work on the external keyboard as well.
A bus station is where a bus stops. A train station is where a train stops. On my desk, I have a work station…