Any enumerable string (A, AA, 123) can be used to code speech events, but if you're not wanting to use "School Name & Entry Initials", I expect what you're doing is the easiest way.
There may be others with different opinions; and regional expectations differ in the U.S.
Recoding your events should not be such a pain, however:
- Recode Events
after changing your preferred coding for each event should remove most of the pain of doing it manually