They really need to implement the small change in the game like iron, steel, and copper coins which are worth less than 1 tria. In the mean time perhaps the players can start using these otherwise useless items in their place to show there really is a need for the sub-tria denominations, 100 bread pieces per tria or some such thing. An apple could be worth two. If the bread piece has the crafter's name on it that could be taken as the bank that issues the denomination and who ultimately will redeem it. The only problem with this is that stack limits might be too small.