First of all I do not have the same lock, but I am confident enough to think that all those locks are universal and should be able to fit perfectly fine on the Duke's disk. Have seen them on multiple streetbikes in my area, so you should be fine and go ahead and purchase it.
My two cents...
I use two of these, one for the front and one for the back disk (I even have a big chain that I tie around the frame but that is used in extreme cases):
They are called AXA Pro Disc and they feel quite strong in my opinion. I think disk locks are mostly about scaring the thieves away. If they want they could still get through when given enough time, or even lift the bike up. But having one or multiple hopefully will make them think twice and go for that plainly parked GSXR around the corner.