As you've used your token you wont be able to pick it and they wont revert it back to Lukar, but they have been fairly good at force-changing it to Guardian#### instead.
Unfortunately you'll need to wait until someone from support sees it as there isn't any ticket options for it to see if they'll filter it for you.
English
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They reached out to me and offered to change it to a more generic name like you mentioned. Hopefully Bungie adds the ability to change our names multiple times in the future like pretty much every other game / platform does. Thank you for your response.
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I guarantee you they won't. Enjoy your new permanent name.