That's one of the things I'll want to ask the tech help folks at Brownell's. From what little I've seen in the way of pictures showing an NECG sight mounted on a rifle it appears that the body of the sight is designed so that the aperture assembly actually sits "down" inside the deep, wide center groove of a Weaver-style mount. Whether that design factor and the sight's range of available elevation adjustment would be enough to allow for obtaining a positive zero with the existing front blade at, say, 50 yds with my loads is something I'd like to get their input on before I buy.
Assuming (and yes, I'm aware of the old saw about that word) that the front sight dovetail is of the "standard" nominal dimensions for width at the base and included angle obtaining a replacement of the proper height to compensate should, IMHO, be no problem. There are dozens of options in a wide variety of configurations out there and a DIY installation is entirely feasible if one owns a few basic hand tools and is reasonably familiar with their use.
While I do like the way the stock front sight is set up with the white line in its center, if I had to go to something like a FO bead it wouldn't faze me. The combo of an aperture rear and a FO front has proven to work extremely well for me on several of my other rifles.
Now that bifocals are a necessity for me, an aperture rear with addition of a FO front bead gives me much sharper definition and is faster to acquire a than the same set-up and a "gold" or "ivory" bead. Those differences are even more pronounced when compared to a plain ramped, post or Patridge type front blade. With traditional open irons, adding a FO front bead has made the difference between "can" and "can't" where being able to obtain a decent sight picture is concerned.
From my experience, a call to the extremely savvy tech help folks at Brownell's has saved me a good deal of money and hours of grief and frustration on several projects. They have access to a vast data base of gunsmithing experience from their professional customers and have been able to provide insights and options for alternative solutions that I wouldn't have been aware of otherwise.