Evidence we have the Harry doesn't

• Harry's recently studied on shaped transfiguration made it to his published thought bubbles at the beginning of the final arc -- it will be used.
• Mr. Grim will probably survive, or have a dying aria, or in some other fashion reveal the story of Peter and Sirius. EDIT I suppose someone could just recognize his dead body.
• Snape can't just die -- he doesn't love Lilly anymore, which means something, and Voldemort returned a favor -- he's got stuff to sort out.
• Harry hasn't used the Foreshadowed Weasley Loot in his pouch. He can use the pouch now, or use it later, but he cannot simply let the pouch fall into Voldemort's hands. Maybe Hermione could retrieve it?
• Unusually, there is not a literary constraint that Harry survive more than to "evade immediate death". That's explicit in the author's challenge, and I think we have a good method of reviving Harry. The explicit lack of constraint is medium evidence Harry's solution will be fatal.

Beneath the moonlight glints a tiny fragment of silver, a fraction of a line...

(black robes, falling)

...blood spills out in litres, and someone screams a word.

The earlier experiment had measured whether Transfiguring a long diamond rod into a shorter diamond rod would allow it to lift a suspended heavy weight as it contracted, i.e., could you Transfigure against tension, which you in fact could.