This is very similar to FLARM devices (https://en.wikipedia.org/wiki/FLARM) for ultralights, gliders, etc. This is already broadly deployed (at least in Europe).
You could check for any lessons learned there. I think you can discount any flight users, because they would like to be seen too by other airplanes.
You could check for any lessons learned there. I think you can discount any flight users, because they would like to be seen too by other airplanes.