No. The problem is not as simple as the problem of being in the wrong time zone. Rather the problem is that the person is not responding appropriately to the cues in their environment that should be synchronizing their rhythms to the current time zone. In other words, a move would relatively quickly end up with the same delayed sleep phase.
No. Delayed sleep phase syndrome (dsps) results from a pathological alignment of one's sleep-wake schedule with one's internal biological clock. While moving to a different time zone could temporarily alleviate dsps, it is likely that one would slip back into a delayed sleep-wake schedule within weeks. See my other answers on dsps for effective treatments of dsps (am bright light, pm melatonin).
Unlikely. This is unlikely to solve the problem.