I finally figured out a simple and elegant method to limit the valid users of Kanohi powers without running into any problems later in the story. Anyone can equip them, only their main user groups - Toa, Makuta, and Turaga in the case of Nobles - have access to their abilities, any additional users from outside those groups just need a brief line of effect text to override the limitation. Boom, done.
I dare you to find me a single Kanohi or Kanohi-related thing that cannot be fit into this framework.
Design Notes:
https://imgur.com/a/iyb6qoQDownload:
https://drive.google.com/file/d/1HufP_tBRd-V9lWmMSKrnO9Fvabwkxs5C/viewDemo Video:
https://youtu.be/EDuhsAZw9Wo