كُلٌّ فِي فَلَكٍ
Each is in an orbit.
For reversible word order, inspect the core consonantal letters in forward and backward sequence; diacritics, spaces and case endings are not treated as the reversible units. “Kull fī falak” supplies the familiar pattern.
Adding a letter in a constructed revision may preserve broad meaning but destroy reversibility. Rhythmic or rhyming prose is not automatically a palindrome.