[FatherCrixius]

Prolly arcane tattoos, the express purpose is that this is something Midas has 'opted into' rather than something thrust upon him. In my mind that would imply the tattoo is maintained through either dumping ones focus or ki into, preventing that focus / ki from being used normally. The thematic reason is the only important part however, that this is a self-restrictive compromise in order to make life more challenging to him, and I would be fine in making lore-based concessions wherever you feel needed king.

I do not think it should be preperational, as in disabling it should not take more than a (dramatic) moment, nor would it make logical sense for him to take this tattoo if it meant relying on another to remove it-- Narratively Ki awoken would be the kind of jump however.