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yup. I just needed to add port forwarding rules on my router for plex (32400 by default I think) and apple screen sharing (5900?) with the apple one I forward a different port number just so it's not obvious that's what the port is for.
as i have a static ip at home I use a subdomain to point to everything. so when not on my home network I have bookmarks for homesweethome.hatbeard.com:32400 for example.
you might need plexpass as well to get it working perfectly externally but it's cheap as chips per month for the convenience.
Thats exactly the plan, good to know. Do you have bog standard home broadband? And built in apple screensharing?