Earlier quoted context omitted.
"Professionals" arbitrarily deciding whose psychological functions are passable in order to allow an elected person to take office sounds horrendous to me, impartial panel or not. If there's anything 2020-2021 and the 4th branch of the gov't taught me, it's that we need to quit putting authority figures in positions of power over the people, for the sole reason of being an authority figure.
Why? I don’t want people with decreased mental abilities serving in important gov positions. Do public companies let aging incompetent leaders stay on as senior executives? I'm not asking for stringent qualifications. Bare minimum. Have time awareness, place awareness, be aware of the connection between action and consequences, have control over bodily functions. I'm not asking for a Chess champion or math wiz.
Edit: I don't disagree with you in theory, but I don't think the system you propose is practicable.