Some good news people. It seems that the Total Eclipse soundtrack and vocal collection was released alongside a new MuvLuv vocal collection three days ago on Feb.6.
That ML vocal collection has one song that may interest you. A full version of Metamorphose.
Muv-Luv Series Vocal Collection
TOTAL ECLIPSE SONG COLLECTION
TOTAL ECLIPSE SONG COLLECTION
TOTAL ECLIPSE ORIGINAL SOUNDTRACK
Woops, I forgot the OST link.