I agree with Niwashi, this would have been a very cool feature if it had been included from the beginning of the game, but not now after the various clans are all well established.

Running with the ongoing example of Elezens; even if all Duskwight features were given to Wildwoods so it would be possible to keep a current Duskwight's features the same, it would still force a change in the character's lore. Even if my character looked identical to how he is now, I wouldn't want him to be anything else but a Wildwood and I'm sure there are Duskwights who feel the same.

But again, Niwashi has a great solution. I would love to see a third clan added to the various races.