I dont know how big risk for "possible dns leak". With other images i use VPN Manager just it looks better. Only with OpenPli I test VPN Config Changer because dont know this Pike_Bishop method and i will test it. Thanks Pike_Bishop!
VPN Config Changer use is similar to Manger. You make different catalog to each VPN with 2 file just rename ...ovpn file to client.conf and put .txt file with 2 lines: username and password. In client conf file line: auth-user-pass
change to line with name of .txt file example: auth-user-pass login.txt
When start plugin and change VPN catalog to this where you have different VPN-s can start use VPN.