Ok, this is an Elder Jedi only trick. It also will only work if you have an Elder Jedi reward crystal.
Just login to SWG, put you Kenobi's Legacy crystal into your main inventory, and start a Customer Service ticket from the new SOE support site.
The link for the support site is:
http://soe-ing.custhelp.com/cgi-bin/soe ... td_alp.php
Don't worry about the link though, as SWG will connect you directly once you click the knowledge base key (default key is now "h").
Once you are there, do a request for email support and simply ask for a CSR to log onto your account to "exchange" or "swap" out your existing Kenobi's Legacy for the B'nar's Sacrifice crystal. Do NOT ask for a CSR to "trade" out the crystals, as they will likely reply that they are "no trade" items.
I exchanged my Kenobi's Legacy yesterday without incident