Maybe you're not aware of this possibility :
If Mr. Wiesel showed the tattoo, (on a hidden part of the arm, or near the shoulder, or on the right arm, and so on) and there is no real verification, because the text is some ambiguos on that, then the entire story will be on all the TV and newspapers in the world, but told and filmed in one way .
You can be sure of this, because they will not miss such opportunity, put on a silver plate, so to obtain at least 3 results:
1) Another indirect "evidence" of the Holocaust. "Do you see, all? Here is the tattoo!!"
2) The evidence that the Revisionists are just haters, not serious people. "People, don't read their garbage!"
3) That is completely right never to discuss with them. "Do you now understand, Joe and Jane, why we don't debate with those stupid haters?"
Not very bad results.
The risk of that challenge, IMHO, could be great, with that ambiguos text, to say the least. You don't have the media. They have the media, they will tell the story, not you. That is the big difference. The arm? Or near the shoulder?, Or an hidden part of the arm not showed by the photos? Or the right arm? What Joe and Jane know about those kind of arguments?They will see the tattoo. A successive medical examnination requested? Who will publish that? CODOH? And then?
Beati monoculi in terra caecorum