In a similar fashion as the FOOD command, which lists quantities of assorted types of food in your various packs, pouches, satchels, how about the WEALTH command listing all your deposits in your various bank accounts, such as
wealth
You have 1259 riln on deposit at the Shadgard Bank
You have 1044 riln on deposit at the Mistral Lake Bank
You have 320 riln on your person
And I'd say to keep the RILN command unchanged; viz. to return the number of coins you have on your person only.