I really do.  There's something about it.  Burnt gunpowder, not unburnt.. that stuff doesn't seem to really have a smell to me.  But once you burn it, that smell.. its sweet.. its like mothballs and rain on a warm summer night.  I would wear it as a cologne, not in large amounts, but just a hint on my neck so that I have that freshly in combat smell that drives all the ladies into psychotic episodes and makes them temporarily lose custody of their kids to the state.

I also like Issey Miyake.

I love it too, but only rifle powder.  Shotgun powder burns with a sweeter/more sour smell that I find nauseating.

I think there's a market for cordite incense.

is cordite even used in making modern gun powder?

Nope.
It would just be a nostalgic thing to have that particular smell.