The problem with any sort of camera or periscope type VR is that it is likely to be quite disorientating as your point of view will be changes plus camera lenses withe the required field of view will have a significantly different focal length to your eyes which will seriously alter your depth perception.
The angle through which your own eyes can clearly register images is actually quite narrow and a lot of the human filed of vision is achieved by rapid scanning eye movements and the brains ability to manufacture a composite image in fill in details as well as being able to process and detect points of interest and focus on them. All of this is very difficult to achieve with cameras trying to give real time information about the real world. In fact a wholly virtual reality is much easier to achieve than a replicating a real environment.
If you don't believe me try walking around or picking things up just looking through the view finder of a camera. There is also the problem of the minimum focal distance of the human eye, you simply won't be able to focus on a screen close enough to your eyes to fit in a goggle type setup.
Bear in mind that that the F35 fighter jet uses a similar system to what you want and that has had persistent problems despite the eye watering sums of money spent on it.
You can get materials which appear opaque from one side but allow pretty decent transparency form the other. Mirrored sunglasses are one obvious example pl;us there are various other coated plastics.
You have discounted meshes, fine mesh and perforated sheet can give pretty good vision, they are, for example used for eye protection in air-soft and mesh face I have personally used mesh face shields in foundry work where I can assure you you need excellent depth perception and peripheral vision.