That might work for today while UAVs are required to be within eye sight, but don't think for a minute the UAS world is going to be happy flying them "eyes on". These units are designed for over the horizon operations operating on an Autopilot. Having the ground station transmit the ADS-B out data isn't helpful even if the data is correct as the transmit range from the ground station may be limited by terrain and they may not be transmitting from anywhere near the traffic that might be flying near their drone.
Due to their size, weight and payload is everything and becomes even more important to them than it is to us. Using the Arcuraus as an example; With an 80# gross weight, every gram added to the aircraft is a huge penalty. The weight penalty of hauling around transmitters, receivers and or strobe packages would be more detrimental than the power penalty. These systems typically have an on board dynamo type alternator and voltage regulator, so their run time is limited by fuel capacity. However, the charging system is also limited due to weight restrictions. They are already powering the autopilot and a radio link to connect with the base station, as well as control servos and probably the payload. Requiring more power for lighting and additional transmitters/receivers would also be a big weight penalty for them. Drag from the addition of external lighting could also be a bit penalty.
The best way to limit UAS systems is for the FAA to approve their operations, then micromanage (mandate) by regulation the addition of lighting, strobe packages, beacons, transponders, ADS-B transmitters and receivers, and self powered emergency locators with huge battery packs. (is any of this sounding familiar?) Once equipped, they will be incapable of flight due to the weight of the same government bureaucracy that seems determined to ground us (or price us out of aviation).
-Cub Builder