My thought is to choose another 5 letter name not beginning with S or ending in the EE sound.
Since they are twins, I feel it would be a feature that would tie the names together, especially since the middle names are both four letters.
S@die Ruth and…….
Eliza Rose
Elise Rose
Lydia Rose
Hanna Rose
Laura Rose
Lorna Rose
Lilah Rose
Liora Rose, Leora Rose
Leona Rose
Liana Rose
Hazel Rose
Fiona Rose
Willa Rose
Alice Rose
Mabel Rose
Norah Rose
Tessa Rose
Aliya Rose
Clare Rose, Clara Rose
Carla Rose
Greta Rose
Freya Rose
Tilda Rose
Maeve Rose, Maeva Rose
Brynn Rose
Taryn Rose
Jenna Rose
Elena Rose
Audra Rose
Quinn Rose
Exceptions to my criteria…
Sybil Rose
Sanna Rose
Sasha Rose
Naomi Rose
Sadie and Eliza would be my first choice. They do not rhyme or sound sing+songy, yet pair so well style-wise. Elise or Hanna, my second choice.