If you make a
donation to the forum, we can likely get your
radio code for you, but you will have to take out the radio to access the label on the back of it.
But as long as it's the original radio, you should be able to take it out without needing the code, as the relevant information is stored in the car's body computer.
The other option is to piggyback a second 12v feed across the battery terminals before removing it, so that power is never lost - but this shouldn't be necessary if you are just fitting a new battery.