I don't think so, as the OS doesn't even know you are using the key, it's all hardware.
Oh no...
Edit:
yea... cut traces on pcb.. manually solder wires into the intended destination.. straight forward mod..
So a relative novice could do this do you think, even on a plate-mounted board? Not sure how these things work, but CapsLock is also fair distance from the original position, unless I used RShift instead.
I think you should not even try.
Here is how, on a Poker X (first Poker), I have remapped the Fn key so pressing it does the same as pressing the Menu key:
(NOTE: my soldering skills are really really rusty)
It's more complicated than I imagined, because I had to cut traces not only on the back of the PCB, but also on the front side (the side with the switches).
My first attempt worked for the Fn key (it did generate the same as pressing the Menu key), but I discovered that the Windows key was now also generating a press of the L key! I had to cut a trace on the other side and add a wire to compensate (the single one).
On the Poker II, which has a metal plate, you will not even be able to see the traces on the switches side.
So you cannot intercept presses on the Fn and Pn keys, because they don't send any event to the computer, and it would be really difficult to mod the PCB either to remap them to keys that generate events.