The bright side is you save $$$...you only need 1 tube
I also have zero vision in my left eye....I run a pvs14. Hand held sometimes and head mounted sometimes. I would recommend a bump helmet over a skull crusher...they are called that for a reason and not comfortable for long stretches.
Do NOT skip on the variable gain. For someone in our situation, the gain can be more useful IMO. Like when hiking I try to run it on a lower gain as I find I get better situational awareness in my peripheral (this is a normal practice...but even more important when you don't have a second unaided eye to stay adapted to the dark environment)....there are times I crank the gain as well, but many times I am glad to be able to turn it down.
I would also recommend to get the cleanest tube possible, I have found for me it makes a difference (maybe moreso then someone with good vision in both eyes).. when you are down to 1 you want the cleanest image in the one you got...