Late answer, but this may help others who wish to achieve the same.
This takes a little circuitous route, but IMHO more safer than other options provided.
Download and install Whonix from here, then follow the steps mentioned here & an example setup here to achieve User > Tor > VPN > Internet
DNS leaks are impossible as all ...
Here is a link how to do it:
It is what user 2020 said. You need to rout VPN traffic over (local) proxy tor. For this you got to edit the ovpn file.
OVPN are configuration files for openvpn. It is an open-source vpn program. Nearly every VPN provider works with it ...