Hi, I'm not sure what the future holds for the Pirates template as far as porting goes (it might happen), the reality is that a Mirror is already what you are looking for, it has the examples and it has no prefabs and such, you can get a game running in minutes
Now as far as specific Unity features supported by Mirror: you will never find the perfect tool that has everything you need exactly at the right time, it will either have most of what you need or appear just as you don't need what you thought you did
I'm not going to push you towards Mirror just because it might not be the tool for you, just keep in mind the perfect tool rarely appears when you need it