To avoid a world wide issue, it seems to me, in my ignorance, that it would be wise to use the latitude and longitude in your proposal for the 44Net, not unlike APRS uses.
For example DDD.ddd.DDD.ddd where D = Degrees, d = decimal degrees, listing Latitude first, Longitude second set.
That would save having a registry world wide, and the only coordination of use would be with your neighbors.