March is quality glass but it is Japanese and not Euro and the coatings are different which in large part is why they work so well when some Euro stuff like Schmidt, Swaro, Zeiss, Leica etc might not be quite as compatible. The resolution, contrast and overall imaging on the March scope, for me, is better than I have seen on pretty much all other scopes but they are not low light monsters like Zeiss and Schmidt, so maybe the coatings that make the Euro stuff so good in low light, are providing some sort of obstacle for NV? Another significant aspect is how low the scope will focus in terms of distance. The March will focus down to very low distances. As in 10yds or so. I don't know the science behind it but a scope with no focus adjustment or maybe something that only adjusts down to 50m or 100m, will struggle more.
I do have a S&B Polar T96 on one rifle and I keep meaning to try the add on it to offer some feedback on this subject but it is on a rifle that I simply do not use for NV work, so I never end getting round to it. I can say I have tried the Vupline on a Leica Amplus 6 3-18x44 and that worked fine. Not quite as good as March and Delta scopes but certainly better than the dedicated digital tubed scopes I have used.
My question would be, if your S&B scopes have focus/parallax adjustment down to at least 50m (Preferably much lower) then you will probably find they will work. How well I cannot answer though. Sorry for being vague. If I ever get round to testing the Schmidt, I will let you now but it is not really on my impending "to do" list right now.