Rosalind is my current favorite
Rose- name. I don't think it's clunky. I used to find it too heavy, but I've really come around to it. It reminds me of Victorian homes and antiques.
Rosemary was my favorite
Rose- name before
Rosalind. It's old fashioned and sweet.
Rosamund, on the other hand, I can't quite come around to. I do find it a bit clunky and definitely too heavy for me.
I think all three sound fine with
Lucius.
I also like
Rose,
Rosalie, and to a lesser extent
Rosa.