I assume the round is a dud or you would just fire it. If it is a dud, try rcmodel's suggestion.
If that doesn't work, your first idea just might. Fortunately, with the AK it is easy to remove the bolt carrier and bolt, so do so.
Then put a bronze rod down the barrel (1/4" is fine - do NOT use a wood dowel) until it rests on the bullet nose. Keep away from the muzzle and point the rifle in a safe direction* and tap the rod with a hammer.
*I have to say that or I will get yelled at. But with the bolt removed, the round can't fire - there is no firing pin and the hammer is out of the way. Unless the bullet is explosive (very unlikely) tapping the bullet nose won't do anything. At worst, it drives the bullet down into the case, but that doesn't make any difference as the round is going to be discarded. Note I said "tap". You don't want to bang the case so hard it flies out of the chamber and the primer strikes some part of the gun. Again, I assme the round is a dud.
FWIW, yes, I have done this on several occasions; nothing went bang and my head is still in place.
Jim