Thanks for the reply's guys.

I looked in my workshop manual (probably shoulda done that to begin with

) and it doesnt mention them as engine bolts in the engine removal section. Perhaps Kawa designed them for a ZX9 conversion!
I had a thought when I pulled the bike apart. In that pic above, you can see a rusty old nut going into the frame rail which bolts that bracket onto the frame. I reckon if I ditched that bracket (which holds on the fairing inner) that I could use the threaded hole in the frame rail to mount a steering damper! Can anyone see any issues with doing that?