In the copy of Echa I used this past 9 Av, the final p'sukim were followed by the notation "סימן יתק״ק". These stand for "ישעיה", "תרי עשר", "קהלת", and "קנות" (i.e. Echa). These are the four books of Tanach that have an unusual custom: when one reads their respective ends publicly, he repeats the second-to-last pasuk after the last is read. (We read the end of Y'sha'ya on Shabas rosh chodesh and the end of T're Asar on Shabas Hagadol.)
However, many sidurim in the S'faradi custom include Shir Hashirim before Kabalas Shabas, and repeat the second-to-last pasuk after the last.
So I wonder: Do any communities/traditions have both the סימן יתק״ק and the custom to repeat the second-to-last pasuk of Shir Hashirim? (Knowing the provenance of each may help answer that.) If so, how do such communities reconcile the two?