Ideally yes (not sure about the legal part of it)
Recent research suggests that you will need more time to adjust to the lack of oxygen at 3,500m/ 11,500ft. Adjusting and acclimatizing needs time. If you fail to acclimatize well lower down you will really struggle higher up. So the closest town at this height is Namche Bazaar 3,440m/ 11,286f, may be spend three to four night at this height which is critical for your safety moving higher.