Gone are the days of the majority of HEMS pilots being ex-military, things are changing fast. I am sure the training will be robust enough to set a high standard for single-pilot NVG flying knowing the individuals involved in the set up. The ac will have all the kit needed to operate into fields.
Weather limits are a red herring, they are not a factor. Like any other flying that I do, if the weather is good enough, I go. If it is not good enough, I don't. What's the problem???
In my past RAF life, we were allowed to do NVG flying with a Navigator in the LHS. What difference would it make to have a suitable trained paramedic?
Finally something I agree with comments made here. Continuation Training. There needs to be regular useful training when using NVG into fields.