On reflection I like the original suggestion for Epsilon orders. Starting with E helps link it to the Echo order. I am not convinced that the Kilo order is warranted because it is a single action not a coordinated set. It represents no saving over “EMP that fleet” and adds another element of training.
I also note that we now have a confusion between NATO alphabetic codes and the Greek alphabet letter names. Could combat orders be limited to Greek and Fleet Patterns use NATO? Since Alpha is common to both, it should be avoided.