The 8GiB limit was put in place intentionally. Mainly to prevent users from wasting space as the primary reason for such a large swap would be hibernation which is not supported.
You can override this limitation by adding the command line argument --skip-validation-size, no need to rebuild the application. You could also change this in the system configuration file for the installer by adding skipValidationSize: true to /usr/share/defaults/clr-installer/clr-installer.yaml.