You unintentionally flatter the JWs. Your scenario suggests the main thing standing in the way of JWs investigating this or similar sites is Watchtower injunctions to avoid these sites like the plague. I respectfully suggest you are wrong. You are far too optimistic about the "average" JWs motivation and/or ability to sift through more than one simplistic side of a topic.
I'd guess that, even with permission granted, a sizable proportion of JWs could not even be bothered to investigate other points of view, let alone opposing ones. In fact, God knows the large numbers of JWs who find it too much of a mental strain to even read the basic fodder in Watchtower publications in the first place. Although unkind, it would not be inaccurate to sum up the "average" JW mentality as dulled and lacking curiosity about other points of view.
In its more than 140-year-history, the Watchtower's main enemy has never been apostasy; instead, it's biggest enemy is apathy and specifically, member apathy. Most JWs who leave do so out of sheer boredom rather than anything more active going on with their brains.