新しいkubeconfigがあるファイルのところに移動して、下記を実行
export KUBECONFIG=${HOME}/.kube/config
export KUBECONFIG=${KUBECONFIG}:$(pwd)/<YOUR_NEW_KUBE_CONFIG_FILENAME>
mkdir -p ~/.kube
kubectl config view --flatten > ~/.kube/config.new
mv ~/.kube/config ~/.kube/config.bak
mv ~/.kube/config.new ~/.kube/config
export KUBECONFIG=${HOME}/.kube/config
chmod go-r ~/.kube/config