Random word thought
Have you ever considered that the word delicacy uses both an k-sound and an s-sound C? Most words who have both those sounds will use C and S respectively, although I just realised "concise" is even weirder in that regard.
Feels like the kind of words where you'd not be able to deduce how it's pronounced without prior experience.
@Felthry I was about to write "so we should write it axent instead" but both Cs belong to different syllables, so that wouldn't work