Hmm, I just thought of another twist to my earlier solution. Instead of (or in addition to) the chance of horcrux hijacking, Harry can mention that his death-burst will interact with Voldemort’s magic anyway, like the wards he placed around the spot, or the dark marks on minions’ hands. That changes the whole plan, now Voldemort must get himself and the minions far away and lift the wards, at least at the moment of Harry’s death. I think that’s another viable solution, separate from the one I posted. Maybe someone should post it?
Hmm, I just thought of another twist to my earlier solution. Instead of (or in addition to) the chance of horcrux hijacking, Harry can mention that his death-burst will interact with Voldemort’s magic anyway, like the wards he placed around the spot, or the dark marks on minions’ hands. That changes the whole plan, now Voldemort must get himself and the minions far away and lift the wards, at least at the moment of Harry’s death. I think that’s another viable solution, separate from the one I posted. Maybe someone should post it?