Adding working musicians and flag bearer bots to NW commander battle server is not that hard, it is actually easy for a good modder, I did it for fun and it took me about four hours. The script uses proper musician and flag-bearer type for all units. Even for cavalry, though you may want to turn that off due to practical reasons. Also it does not interfere with other game types in any way, for example it does not alter typical equipment for bots, though if you host a serious CB server you shouldn't be concerned about that.
Anyone who wants this script, and can prove that he hosts a serious CB server, can send me a PM and we'll work something out. Unlike a certain modder, I will not insist on having my name written all over the server and spammed within announcements each couple minutes.
As for NaS, it is not possible unless developers implement it or make their module system public.