You could recruit an extra member to the CC and make their duties strictly dealing with anonymous posts for others. Players who wish to post anonymously can then write up the post they want published and send it to this CC member along with the thread they want it posted in, which then gets posted for them when time permits. Alternatively, you realize that you can change the display names of your existing accounts, right? Presumably you're only really known by one of them so if you have an alternate one you're not using for the forums anymore, just change its display name.