You can specify different template configuration files to use when you create your build directory using the TEMPLATECONF variable, for example:

$ TEMPLATECONF=meta-custom/config source oe-init-build-env <build-dir> 

The TEMPLATECONF variable needs to refer to a directory containing templates for both local.conf and bblayer.conf, but named local.conf.sample and bblayers.conf.sample.

For our purposes, we can use the unmodified default project configuration files.