I tried this for a few weeks after learning the truth about "the truth." It just churned my stomach. Eventually just being in the Kingdom Hall itself caused me to feel nauseous and lightheaded. Listening to the cult-speak was like trying to find my way around some freakish hall of mirrors. I ended up quitting more or less cold-turkey despite efforts at a fade.
Being an outspoken person, I realised that continuing to attend could lead to more dire consequences. I wanted my family relationships to remain intact and so I just walked away and hoped that nobody would try to corner me with any loyalty questions.
Anybody who manages to implement the above tactic has to have a high tolerance for allowing garbage to just wash over them. I do not and would have ended up arguing with someone over one of the Watch Tower's ridiculous, patched up doctrines. And using sound Biblical or scientific reasonings would only have made me more dangerous in their eyes.
The "periphery approach" would require a cast iron stomach in my view and anyone who could pull it off would have my astounded admiration.