I love Isidore for a boy (second favorite name for a boy) and Isadora for a girl but Isidora looks wrong to me and I much prefer the pronunciation of Isadora.
Both Isadora and Isidora are lovely, underrated names. I love how they are feminine and sophisticated but not frilly or over the top. I do like Isidora. I just prefer Isadora.
My favorite combos from your list are:
Isidora Charlotte
Isidora Jane
Isidora June
Isidora Millicent
Isidora Peony
Isidora Vivienne