But it can work. You just need some percentage of your local network to have publically addressable IP's port forwarding takes care of that. You can also do ipv6 as well as ipv4. I think most isps support it now.
Again it isn't going to be easy. Not with cgnat etc, but I think it can be done. You just have to have sensible expectations of throughput. The lighter you can make the protocol the better.
