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A proper on-site method for this will be implemented (at some point)
You cannot get the Crescent Rose as it is a HireSWD. This means someone paid for that weapon to be made exclusively for them. Therefore it is most unwise to go asking for it, as you are guaranteed not to receive it.
All done you can find it in your inventory above, it'll take up to 1h before it will appear on the server. So it's best not to try changing it until then