I would add that certain devanāgarī śva and sva can be easily mistaken for kha. Even if we do not consider the pronounciation and we rather stay on the paleographic level, it is very easy to explain how dhaneśvara° could become ca nekhara°. That's why I took for granted that ca nekharālamkāra is just a corruption of dhaneśvarālaṃkāra and as such not worth taking in consideration.