The FCR are sent automatically, I assume, so your only option is to speak to your FO.

S/He will tell you how best to proceed and if the renewal can be done earlier.

Another option is to store the firearm until you return then renew and get it back.

Here is a list of RFDs. Your options, close to you, are not great but have a look and see if one suits then give them a call.

I still think a call to your FO is a better starting point. See if you cannot get this done early.