Well put.

Still leaves the question: Change the Litany (if so, how)? Or just don't use it in this particular context?

I supposed I should probably reveal a little bit of the context: There will be a Litany following a spoken presentation of Beyond the Reach of God. That Litany can either be the Litany of Gendlin, or the Litany of Tarski with a phrasing similar to:

If the world will be destroyed during my lifetime,
I desire to believe that the world will be destroyed during my lifetime.
If the world will not be destroyed during my lifetime,
I desire to not believe that the world will be destroyed during my lifetime.
Let me not become attached to beliefs I may not want.

(Litany of Tarski's already getting used in multiple other places during the night, so there's no advantage to using purely for the sake of using it. I believe there is [slight] advantage to using Gendlin at least once to create a sense of completeness)