Personally I prefer Ember on its own and Lucinda over Cinder-lee. But you gotta go with a name that makes your heart sing and if those names are magic for you then why not!
I liked the suggestion on Emerald.
Emerald Brianne could get you the nn Ember?
Aella Katherine (ay-la)
Starling Cinder Leigh
Millais Lucindy (mill-AY)