No, the support tickets would take much of my time. I am intentionally vague when discussing this topic as someone could read, try, fail, then ask for support. Network security can be at risk when going this route. If a user has a deep understanding of Certificates then they likely understand the risks involved and know how to configure their device/proxy/client.  If you do not want to use ISY portal I recommend setting up VPN.  VPN is available on most mid/high end routers and is much easi