Also, an NVD setup to a helmet mount is not going to fall naturally behind your optic and be as easy or quick as using the optic in the daylight. When you set up your NVD, you pick a distance at which you want things to be in focus. If you are in a combat environment, you would focus your NV at the distance in which you expect to engage the enemy...and your rifle will be completely out of focus (which is one of the reasons you can't use your iron sights). With the EOtech and Aimpoint, the reticle is on the same focal plane as the target, more or less, so you can be focused on both the target and the reticle at the same time. In my opinion, it is awkward lining up head mounted night vision with weapon mounted optics quickly. With my PVS-7, the most efficient way is to tilt the rifle like the army teaches one to shoot with a pro mask on. I have both an EOtech and an Aimpoint.
Way back, occasionally an individual might focus one lens of his PVS 5 at close range, and one at long range in an attempt to overcome some of these issues.
With an IR laser and a head mounted NVD, the weapon is presented in the standard fashion, except the head does not need to get down behind the weapon to aquire a sight picture. The laser is activated, and the target is engaged much more quickly, IMO.
As to shooting with a '14 on the left eye, and a aimpoint on the right, I don't think that would work well (although I have never tried it). The '14 does not have to be parrallel to the bore of your rifle to present you with an image... my eyes won't 'lock' together, and point in the same direction, if I can't see the same thing with both eyes. I think it would be a goat rope shooting that way.