Actually, weapons were allowed to be carried both openly and concealed because the law was so strict. Even the last Ard Ri (High King) of Eiré, Brian Boru, (progenitor of todays O'Briens) had to pay a 'fine' to a clann for the killing of a clansman.
You also had the fact that weapons to the Celts were/are held in the same light as the Japanese although rather than housing the soul of the warrior, they have their own 'spirit'.
They were not drawn/used willy nilly and even Celtic Warfare was highly ritualised with Champions demonstrating their repetiore<sp?> of battle skills rather than a full blown attack. If one Champion was noticably superior in skill, then often as not this display alone was enough to decide the fate of the battle with the less skilled Champion conceding before blood was actually spilt.
This was a highly stratified society governed by intricate laws and ritual and with a wee bit of tweaking would fit 'Kang'.
Even with today's laws in New South Wales, Australia on carriage of edged weapons....it is illegal to be in possession of a blade/knife in public....the carriage of hidden blades on religious grounds is legal.
The Sgian Dubhs can have no religious connotation attached to it and "cultural" reasons are frowned upon as a reason to carry any sort of weapon in todays' modern society.
To summarise, I believe the argument can be made that the Traveller LL can be seen to be 'relative'. If we are talking about "proto-traveller".....let's assume that the survey results (UWP) can be seen as the LL within a local society rather than the Imp standard....or at least leave it open to interpretation.
I, as always, am expressing an opinion as far as the TU goes and YMMV IYTU.
Sláinte (Your Health)