I think you've dreamt up a fabulous name! I'd pronounce it Rick-arr-dean (yes, with a prominent rolled R in the middle).
Feminisations that I find "clunky" but particularly like are:
Petronella, Derfla (
Alfred backwards),
Wilhelmina,
Bernardine,
Berengaria,
Fabrizia,
Fidelia,
Hortensia,
Laurencia,
Nemesia,
Pelagia,
Theophania,
Theodosia
I've also met a Johnelle and a
Benedicta