Since you already use libDataBroker, its simple enough to add a minimap button for easy bank access.

in Bagnon\components\brokerPlugin.lua

add to end of file:

local icon = LibStub:GetLibrary('LibDBIcon-1.0', true)
function Addon:OnInitialize()
	if not Bagnon_MinimapButton then Bagnon_MinimapButton = {} end
	icon:Register("Bagnon", Plugin, Bagnon_MinimapButton)
end

and then Bagnon_MinimapButton to Bagnon.toc SavedVariables so it saves the button position