Is there any other way to do this besides changing all episode numbers?

For example:
- a series I have added has 22 episodes.
- "file #1" consists of episodes 1 and 2 (as they appeared on tv and are listed on the blu ray).
- the metadata mezzmo is grabbing calls this file E001. (i would like it to do something like "E001 E002: [titles]"
- the subsequent file consists of episode 3 and is correctly named E003.

Is there a way to do something like "E001 E002: [titles]" for that first double episode?

Or do I need to redo all episode numbers in properties so my series lists 21 episodes instead of 22?