Why not add a chat color? This means constantly performing upgrades to systems and other features.
You can switch codes mid-message by entering the new code.
NumberFormatException: For input string: "12.
Neither Shift+3 nor Alt+NUMPAD0+NUMPAD1+NUMPAD6+NUMPAD7 which should both make the § Symbol work.
In an attempt to extract the player's raw original chat message, the Shopkeepers plugin listens for the chat event at lowest priority.
I don't know which other previous incompatibility your event listener priority change has resolved, so I cannot comment on how likely it is for users to run into this other incompatibility, or whether there might be an alternative to resolve it.