Replacing Yoda with Aayla??

[DUMAH11523]

 Is there a way to replace Yoda with Aayla? I cant figure out how to change a hero with a short name (yoda 4 letters) with one with a longer name (aalya 5 letters).
Same with others like grievous (8 letters) and countdooku (10 letters), leia (4 letters) and luke_pilot (10 letters)...

Hex edit is the way I had tried but the yellow message for select the hero dont even appear at all.
So how can it be done?

[Anyder]

U can do it by modding the mission instead of hexediting.

Also u can do it by hexediting, and the file size will obviously change, but that shouldnt be a problem.