Thank you for your comments and advice. I am genuinely grateful.
I will no doubt be proven wrong, but my strategy is for this JW lady to carry my thoughts into their rabbit warren. My aim is for the bigger fish to be challenged (even though I will not be a witness to that).
This JW lady is always at her location at the same time each week, and we have chatted several times, quite innocently, To me, this means she will continue to stand at her allocated place at her allocated times. She should not be able to run away from me in the succeeding weeks, like a rabbit startled in the headlights.
That's my theory, but tell me where my assumptions are wrong.
I am not good on the emotional analyses, so I would like to know if a JW would really be moved by hearing of the murders carried out in Yahweh's Name. They are fearfully conscious that Yahweh is about to slaughter billions.
I used to have a list of NT proof texts that spoke of witnessing Jesus' Name. But this assumes a position on Isaiah 43:10 that I no longer hold to.
I now believe that Isaiah 43:10 stands in the context of condemnation. The Chapters beginning with Isa 40 lie in the context of the neo-Babylonian Captivity and form part of the political push by the Yahweh-alone Party.
In the overall context of Isaiah 43:10, the (deutero-Isaiah) writer says that although they had witnessed Yahweh and his greatness, nevertheless the people remained disobedient, and that is the reason they deserved to be cast aside.
As a tangential comment, when the Watchtower speaks of the "message" going into "all the world", for those Middle Eastern NT writers, "the world" spoke of their known lands. Paul wrote that all nations had been reached in his own time (Rom 10:17-18//Ps 19:4; Romans 1:8) and this is confirmed by pseudo-Paul (Col. 1:6, 23).