I quite like the “closing” ET-sound of [name_f]Cosette[/name_f] and [name_f]Odette[/name_f] with the combo.
Of the two, [name_f]Odette[/name_f] would be my pick as she’s a bit stronger than [name_f]Cosette[/name_f] while being just as feminine; she would be able to hold her own following up bold [name_f]Rhoswen[/name_f].
I’m between [name_f]Emma[/name_f] [name_f]Rhoswen[/name_f] [name_f]Claire[/name_f] and [name_f]Emma[/name_f] [name_f]Rhoswen[/name_f] [name_f]Lucille[/name_f], to be honest! Both are positively stunning, but I think I slightly prefer [name_f]Lucille[/name_f]. I love seeing [name_f]Rhoswen[/name_f] get some attention on here too!
[name_f]Rhoswen[/name_f] is my all time favourite! [name_f]Emma[/name_f] [name_f]Rhoswen[/name_f] [name_f]Lucille[/name_f] would be my choice as I seem to love it with L names. My combo is [name_f]Rhoswen[/name_f] [name_f]Lark[/name_f], but I may also may use [name_f]Rhoswen[/name_f] [name_f]Edythe[/name_f] [name_f]Lark[/name_f] as it’s an honour name for me. [name_f]Emma[/name_f] [name_f]Rhoswen[/name_f] [name_f]Edith[/name_f] is nice too!
[name_f]Emma[/name_f] [name_f]Rhoswen[/name_f] [name_f]Camille[/name_f]! I kind of like the matching M’s of [name_f]Emma[/name_f] and [name_f]Camille[/name_f], since they’re surrounded by totally different sounds. It makes the combo feel pleasantly symmetrical. Another name with an N sound like [name_f]Rhoswen[/name_f]'s would be cool, too.
I think your existing combos are all solid options, but since you ask, here are a bunch more ideas: