Des, pls see attached photo, the ports are 9010 & 9020. My machine's firmware is pretty new, v3.4.62, and those 2 ports only appears on 'Upnp' tab, but not on the 'more setting' tab, still pretty confusing, I think Hik is trying to redesign its P2P service, I doubt your camera will have the most updated fw to include this function.
As for your solution, you can do this: as long as you can use p2p to liveview your camera, you can log onto your 'hik-connect.com' account (NOT
WWW.EZVIZLIFE.COM, BUT
WWW.HIK-CONNECT.COM) use the same ezvizlife account credential. Inside of that web page, it will reveal your camera's public ip, then you can add that camera in your ivms4200 using the regular ip/domain method, then you can 'remote config' it.