If you find this little app useful please rate.
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OpenVPN for Android(https://play.google.com/store/apps/details?id=de.blinkt.openvpn)
And
Tasker(https://play.google.com/store/apps/details?id=net.dinglisch.android.taskerm)

is needed to run this.

You can use load app in tasker to directly launch openvpn please use the 'data' filed in the Load App settings in Tasker to set the name of the vpn profile to launch.
If you cannot find this app in the Load App settings check the "All" toggle in the select app page.