Switching around authentication methods doesn't impact your bungie.net user profile status (they're two separate accounts). You can switch them around freely as you please. You can view the following help thread for specific information on how to do this.
[url]http://www.bungie.net/en/Clan/Post/18405/64336042/0/0[/url]
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Thanks. I will link it as soon as PSN is back up.