The key is not to put all your hopes in one novelty technique. You should come up with new ones as a way to stay light and adaptable. It's a godsend when it works, but eventually it fails, and it doesn't just fade away. The failure starts to reinforce itself and the technique just becomes the new medium of the stutter, to the point that a new technique may as well be to deliberately avoid using the old technique. These techniques are more mental than physical so we should be aware of how they affect our thoughts rather than our speech directly. If a technique works because of the novelty, then consistently creating novelty is a sustainable means to fluency.