I'm sure that this could be done safely enough, especially if the UAV is equipped with Flarm or a transponder and it avoids flying in the pattern. However, UAVs do malfunction at a higher rate than piloted aircraft and loss of control occurs quite often, even with commercial and military operators. Some care will be needed!

The main problem is the FAA's refusal to permit any commercial use, which is certainly likely to restrict any operations such as those proposed. (Not that this will prevent some guys doing it anyway).

Mike