you will find that the Nbox will give a slightly different sound than if you were to use actives. The 4 times i have heard the Schoeps > NBox i find they have a more hollow sound, and slightly "tinny".
Other than the battery factor, i dont understand the advantage of running bodyless > pre/ad for your everyday taping situation. Hell, if you run NBox>AD, you're still going to have an ecocharge type battery....Schoeps>V3 work very very well and its still super small.
just my thoughts on your question....