Yep, but AgNO3 works cleaner, and you can recycle the AgI to AgNO3 and use it again.
I'v tryet som diff. routhes to the iodide. Just iodine wont work, Iodine and H2O2 and H2SO4 did'nt work either.
ICl works ok, but you gets some off the Cl product too.
And by the way, it is werye small amounts off KNO3 you have to add in that article, but i guess too much wont doo annye harm.
But i guess its rather academic. Why not just brominate if you want to turn 1,4 to the more fun aldehyde (via Grinard).