As title says, I suggest that there should be a possibility to swap your subclass to main char, i.e. you are HE main and SWS subclass -> swap to SWS main and HE subclass.
It is a nice way to make additional buck for server and cool way to experience new possibilities for players.
note: swap would be only possible for chars that are:
- not hero
- not noblesse or with 0 olympiad matches
- 75+ on subclass