I'm looking for bands that sound similar to later Amorphis (melodic, mix of clean and growls with piano/keyboard & acoustic guitar parts).

They don't have to have both clean and growled vocals.

I guess some examples may be... Opeth, Swallow the Sun ...

Though it would be preferred if the bands were more keyboard focused. (Stuff like Amorphis' "I Of Crimson Blood", "Thousand Lakes", "Silent Waters", "Black River")

Cheers.

It's probably not exactly what you are looking for, but the Kingston Wall (a Finnish psychedelic rock band) influence on Am Universum (and to a lesser extent on the albums surrounding it) is undeniable.