Absolutely love Geneva she’s so gorgeous! I also love that you can get the nickname Evie which is a personal favourite of mine. Geneva is beautiful.
Middle name wise I can tell your a berry straightaway as I feel only a berry would make so many different connections as I feel the average person would not make these associations. So maybe a little overthought but still completely get that you want the perfect middle name!
I love Geneva Valentine I thought that was special indicating that you’d want to break the names up with another middle name I think something with an ‘ie’ sound ending would work like Geneva Delphi Valentine, Geneva Rumi Valentine or Geneva Bridie Valentine. For me I like the idea of Geneva Romilly Fern or Geneva Pomeline without a second middle name. If I felt I had to have another middle name would go Geneva Pomeline Niamh.
Onto Theodosia I think Florence Antigone paired with Theodosia feels very striking and bold. I like the drama behind this combination. If I was to offer a fresh alternative I think I would go Theodosia Sunday Maren or Theodosia Elspeth Lavender.
Finally love Rosalind such a dreamy romantic choice and Rosalind Iolanthe Hero is the ultimate heroine, beautiful name. For me I would probably use Rosalind Alara Autumn or inspired by your choice Rosalind Calanthe Lark.
Hope this helps