Normally the variables are equal and just have a KEYBOARD (or no prefix at all) or GAMEPAD as prefix. Try just PROVISIONER or check the esoui code at github (link is at the wiki e.g.) at esoui/ingame/provisioner or similar.
The variable is either defined in the xml file or at the bottom of some lua file in the keyboard files, like PROVISIONER = Zo_Provisioner:New(...)
https://github.com/esoui/esoui/blob/...rovisioner.lua
Line 629