Is it a small enough job to add a player's license level to the NCN (or NCI) packet? And if not, could it go on a list?
I had always thought it was in InSim somewhere, but having had a need to use it this week I've found I was confusing it with having seen reference to a host's license level. It's not in PubStat, and I've failed to extract it from LFSWorld (calling the relevant page from externally gives an error). Currently I'm scraping forum pages, but there are issues with that too that cause some misses.
There's only one spare byte in NCN, but maybe it could be 2/3 bits in the flags instead. Plenty of space in NCI, if it's OK to restrict the info to InSims who receive that one.