This is really incredible. Finally, after all these years, a hobbyist has invented a way to kill off the most dreaded pest we've encountered yet without ripping your tank apart. Great job and thank you for thinking outside the box and being brave enough to try it!
What made you think that raising the K would be a way to kill them off? I mean, it makes total sense in hindsight. I wish I would have thought of it!
The only downside to this method is that you have to be able to catch all your fish. That can be quite difficult for some, especially in a large tank with large colonies, but as you pointed out, it may be possible to let the solution stun them so you can catch them and then transfer them to a hospital tank to recover. It would probably be wise to save a couple of small pieces of LR rubble so that you can use them to repopulate your bacterial populations as well as your pods and other critters.