well basically, just don’t have all the unlocked stuff. so people who want to experience-vanilla style battlefield can experience that, unlocking weapons kits etc while ranking up… oh and maybe have bfbc2 stats reset would be nice.
the only way would be to host your own server, you would then control if weapons are unlocked or earned. There isnt a way to de-rank players who join your server, so if their ranks are high enough they will have weapons. You may have noticed many servers hike their XP very high to attract players, so many are at 50 in no time at all. Another possibility while hosting your own server is limiting the weaponry available to any player no matter what rank. You can run a vanilla server by not modding the server files, but rank is beyond your control. hope this helps