While it is difficult to believe that power-seeking is entirely orthogonal to choosing a career in politics, just how do you envision things will go with politicians who are not experienced at actual politics?

Again, wanting a representative who is not experienced at politics to represent you is kinda like wanting a lawyer who isn't experienced at practicing law to represent you. Or a doctor who isn't experienced at medicine to treat you.

What I'm saying is, I think you've latched on to the wrong quality as a focus of your ire. People being career politicians is not the problem, it's people being corrupt power-seeking assholes. That's a difficult problem to solve, I know, which is why it is so tempting to blame the problem on something easier to solve, but I think that sentiment is one pushed largely by career pundits to manipulate people.