You CAN be a Fae Coercer, with limitations. Here's how it works:
Roll Fae Illy, betray to become Coercer. Betray again back. BUT!
NEVER FINISH THE SECOND BETRAYAL! WHen you are supposed to talk to the class trainer, NEVER do it. Note that not completing this step means that you are NOT a citizen of that city, just a "tourist".
Downsides:
Your CALL will always go to Haven. You Guildhouse call should work normally.
You cannot buy a house anywhere (except Haven?).
Some merchants will not talk to you.
You may or may not be able to get writs from the city you're living in.
Hope this helps. I did it with an SK in Qeynos.
Howard