The Cosa is accessible to everyday Talossans. If someone wants a voice in choosing the next King, they simply can become an MC.
Except nobody runs for Ziu or votes a certain way just to elect a King. Most likely when we vote in the GE we won't even know a King will be elected that term.
The Ziu (maybe, hopefully) represents the political views and general policy direction Talossans wants to take. In many other aspects it might not be representative of Talossa at all (for one thing, it is comprised entirely out of people with an interest in Talossan politics).
Ultimately when it comes to the direction of this country the power of the King is very limited. The people, both directly and through representation by the Ziu decide what the future of this country looks like, which is inclusive and democratic and overall a good thing.
But what use is there for a King then, if they are just an extension of the political hype of the day, like most other institutions already are. I'd much prefer it if our King were an extension of our long term history and culture. The long and real history of Talossa is what separates from most other micronations and what makes Talossa far more appealing. I think the selection process proposed by Ian reflects that much more than just letting the Ziu decide.