I finally have shortlist. My SO was actually quite helpful and asked that our kids have two middles! since it made names sparkle more. [name_m]New[/name_m] names on list too.
Top three combos/double-combos
[name_f]Juliet[/name_f] [name_f]Anastasia[/name_f] [name_f]Gwen[/name_f] and [name_f]Giselle[/name_f] [name_f]Aurora[/name_f] [name_f]Beatrice[/name_f]
[name_f]Juliet[/name_f] [name_f]Isabella[/name_f] [name_f]Maud[/name_f] and [name_f]Giselle[/name_f] [name_f]Rosalie[/name_f] [name_f]Louise[/name_f]
[name_f]Cordelia[/name_f] [name_f]Rosalie[/name_f] [name_f]Louise[/name_f] and [name_f]Juliet[/name_f] [name_f]Isabella[/name_f] [name_f]Meadow[/name_f]
other ideas:
[name_f]Aurora[/name_f] [name_f]Rosalie[/name_f] [name_f]Louise[/name_f] and [name_f]Cordelia[/name_f] [name_f]Juliet[/name_f] [name_f]Giselle[/name_f]
[name_f]Cordelia[/name_f] [name_f]Juliet[/name_f] [name_f]Giselle[/name_f] and [name_f]Charlotte[/name_f] [name_f]Helena[/name_f] [name_f]Thisbe[/name_f]
[name_f]Charlotte[/name_f] [name_f]Rosalie[/name_f] [name_f]Giselle[/name_f] and [name_f]Juliet[/name_f] [name_f]Gabriella[/name_f] [name_f]Louise[/name_f]
Thoughts
[name_f]Juliet[/name_f] [name_f]Anastasia[/name_f] [name_f]Helen[/name_f] and [name_f]Aurora[/name_f] [name_f]Beatrice[/name_f] [name_f]Meadow[/name_f]/[name_f]Louise[/name_f].
My favorite is [name_f]Cordelia[/name_f] [name_f]Rosalie[/name_f] [name_f]Louise[/name_f] and [name_f]Juliet[/name_f] [name_f]Isabella[/name_f] [name_f]Meadow[/name_f]. 
[name_f]Charlotte[/name_f] [name_f]Helena[/name_f] [name_f]Thisbe[/name_f] and [name_f]Juliet[/name_f] [name_f]Isabella[/name_f] [name_f]Maud[/name_f]!
I like [name_f]Juliet[/name_f] [name_f]Gabriella[/name_f] [name_f]Louise[/name_f] and [name_f]Giselle[/name_f] [name_f]Aurora[/name_f] [name_f]Beatrice[/name_f]. Would you consider [name_f]Juliet[/name_f] [name_f]Rosalie[/name_f] [name_f]Louise[/name_f] and [name_f]Giselle[/name_f] [name_f]Charlotte[/name_f] [name_f]Aurora[/name_f]?
I like from your list:
[name_f]Juliet[/name_f] [name_f]Anastasia[/name_f] [name_f]Gwen[/name_f] and [name_f]Aurora[/name_f] [name_f]Rosalie[/name_f] [name_f]Louise[/name_f]
Switched a few around:
[name_f]Juliet[/name_f] [name_f]Rosalie[/name_f] [name_f]Isabella[/name_f] and [name_f]Aurora[/name_f] [name_f]Thisbe[/name_f] [name_f]Charlotte[/name_f]
[name_f]Juliet[/name_f] [name_f]Isabella[/name_f] [name_f]Maud[/name_f] is beautiful! I would prefer her sister to be named either [name_f]Aurora[/name_f] or [name_f]Cordelia[/name_f].
I’m most partial to [name_f]Cordelia[/name_f] [name_f]Rosalie[/name_f] [name_f]Louise[/name_f] and [name_f]Juliet[/name_f] [name_f]Isabella[/name_f] [name_f]Meadow[/name_f] from your list! If I were to pick a twins combo from your list myself, it would probably be [name_f]Juliet[/name_f] [name_f]Isabella[/name_f] [name_f]Meadow[/name_f] and [name_f]Charlotte[/name_f] [name_f]Rosalie[/name_f] [name_f]Giselle[/name_f]. But all the names on your shortlist are lovely - I don’t think there’s a “wrong” choice among them!
I love [name_f]Cordelia[/name_f] [name_f]Rosalie[/name_f] [name_f]Louise[/name_f] and [name_f]Juliet[/name_f] [name_f]Isabella[/name_f] [name_f]Meadow[/name_f]! I think [name_f]Cordelia[/name_f] and [name_f]Juliet[/name_f] have a very similar, complementary vibe. They both feel romantic, historic, and sophisticated. A perfect pair! Honestly, I don’t think [name_f]Giselle[/name_f] is as magical or pretty compared to them.
My favorite for first names are [name_f]Juliet[/name_f] and [name_f]Cordelia[/name_f] together, and I think [name_f]Juliet[/name_f] [name_f]Isabella[/name_f] [name_f]Meadow[/name_f] is perfect. I’m having a harder time deciding which middles I like for [name_f]Cordelia[/name_f]. I like [name_f]Rosalie[/name_f] and [name_f]Louise[/name_f], but together they feel almost too similar, like you just mixed up their letters. If [name_f]Isabella[/name_f] has [name_f]Meadow[/name_f] I feel a bit like [name_f]Cordelia[/name_f] should have a nature name in the mix too, like [name_f]Aurora[/name_f]. Maybe [name_f]Cordelia[/name_f] [name_f]Rosalie[/name_f] [name_f]Aurora[/name_f] or [name_f]Cordelia[/name_f] [name_f]Louise[/name_f] [name_f]Aurora[/name_f].