Translation of "unrepeatable" into French

What an unrepeatable privilege it will be to find ourselves among those victory singers!

Tous ceux qui chanteront alors cette victoire auront un privilège unique.

In each separate case all of this has its own unrepeatable subjective expression, its affective richness, indeed its metaphysical beauty.

Et tout cela, en chaque cas, a les qualités d’une expression subjective irremplaçable, d’une riche affectivité, d’une beauté proprement métaphysique.