My immediate application is actually at a grandparents house. They live in the middle of nowhere and I have to set up a point to point network to get service in the house. I am setting up some unifi APs for wireless in the house. My goal is to upgrade the netgate box in my house and move my sg-1100 to their house.
After that it lives in my backpack. I was hoping to set up a VPN back to my house on it but, given your experience, it sounds like that is going to be a bit of work.
Have you heard of openWISP? It is a way of remotely managing openwrt.