Sharing my experience.
After 21:45 ERS - KIK express, there is no proper daily train towards Coimbatore. Between, there are weekly trains which are premium ones. Amritha also an option, but till pgt. After amritha at 1, next train towards PGT side is in the morning.
Next daily option is 13352 which departs at 7 in morning. So a daily train departing around midnight or after amritha towards CBE side is needed.....