i dont know much about vpn. try using the Layer 2 Tunnel Protocol port 500 give a look here. https://www.bestvpnz.com/tutorials/how-to-set-up-l2tpipsec-vpn-on-windows-10/

disable the default startup, then in Task Scheduler create your own task to start up the program, set the task to run at startup, set your delay time there.