have you tried using flora at home for a while to see how it feels . it may be that when you begin to use it , it immediately feels right or alternatively you may know it's not the one .
with Dd5 we changed her name at 9 months after 9 long months of name regret . 3 years on nobody can remember the name she was given at birth . when we first decided to change her name there was a name i loved which when we tried it on her didn't feel right for her even though i love the name . in the end we chose her 2nd mn which as soon as we used it fitted perfectly . A word of warning though the angst re her name didn't go immediately , i felt guilty for changing it ,i did feel daft and people did look at me as though i was mad . i also often questioned whether i'd chosen the right name and whether i should have changed it after all .3 years on it was the right decision and it no longer causes any concern.
like you we ended up with 2 mns which have similar sounds /endings and not the best combination of initials . if we had given her her new name at birth she wouldn't have been given these 2 mns but at the time we changed it i posted for advice on mumsnet and at the time there was a lady whose parents had changed her name when she was a few months old but in doing so they'd replaced one of her names with another mn for example having been abc she became cda , she still felt 30 years on that her parents had robbed her of one of her birth names . she still regretted their decision and wished that they had just added a new name to her original 3. she said she felt as if she'd lost part of her identity. maybe something to bear in mind when deciding whether to remove one of her initial birth names . it certainly influenced me when deciding whether we should ditch one of dd's original birth names
i like both names although marginally prefer Greta as it feels more unusual than flora .