Drop this in /usr/local/bin, chmod it 755, make sure your /etc/openvpn/vars sets EASY_RSA='/etc/openvpn' instead of setting it to the current directory, and you're pretty much off to the races.
Will create credentials if none exist, or use existing credentials if a keypair has already been created, and drop a single-file client .ovpn including all keys and certs necessary into /tmp/clientname.ovpn.
create-vpn-creds expects to find a template config file at /etc/openvpn/templates/client-template.base. Sample config file included in this repo.
root@yourserver:~# create-vpn-creds clientname
Creating credentials for jrs ...
Credentials exported to /tmp/clientname.ovpn.
root@yourserver:~# create-vpn-creds clientname
Existing credentials for clientname found ...
Credentials exported to /tmp/clientname.ovpn.
root@yourserver:~#