Answer to objections to sortition

This post opposing sortition seems to assume direct random selection from the general population, when historical sortition systems have never worked that way. They alternated sortition with a screening stage, a system I call fetura, from the Latin word for breeding, which involves such alternation. The systems of Venice and Florence are examples of this. I have one, as part of a model constitution.
1. Selection of officials is multi-stage, beginning at the most local level (wards), but those selected at random are not limited to selection themselves for the next round.
2. As for policy juries, there would be more than one on any policy, and policies would go through the same kind of fetura, using competing juries that would decide how to present the policy options to one another. Some such juries, which I call inquestries, would function like grand juries to empower prosecutors to propose and defend policies to further juries.
3. Corruption of members would be be inhibited by audits of the members of one jury by another. There would have to be full disclosure of assets and income. That does not prevent payoffs to cronies, but the same process could be used for that. Everything checks and balances everything else.
4. One inhibition to corruption would be that selection is not confined to the selectees of the last random round, so that reputation for integrity would be important. One might call the system reputaracracy (combining Latin and Greek). Everyone would have an incentive to acquire and maintain a good reputation, because not all selection is random. Our modern system of credit scoring is an example of this, although it can be manipulated.
One can describe the system used by political parties in their nominating process as a kind of fetura, although it is vulnerable to dominance by cult leaders.

Venetian system

New regulations for the elections of the doge introduced in 1268 remained in force until the end of the republic in 1797. Their object was to minimize as far as possible the influence of individual great families, and this was effected by a complex elective machinery. Thirty members of the Great Council, chosen by lot, were reduced by lot to nine; the nine chose forty and the forty were reduced by lot to twelve, who chose twenty-five. The twenty-five were reduced by lot to nine and the nine elected forty-five. Then the forty-five were once more reduced by lot to eleven, and the eleven finally chose the forty-one who actually elected the doge. None could be elected but by at least twenty-five votes out of forty-one, nine votes out of eleven or twelve, or seven votes out of nine electors.

Florentine system

Florence was governed by a council called the signoria, which consisted of nine men. The head of the signoria was the gonfaloniere, who was chosen every two months in a lottery, as was his signoria. To be eligible, one had to have sound finances, no arrears or bankruptcies, he had to be older than thirty, had to be a member of Florence’s seven main guilds (merchant traders, bankers, two clothe guilds, and judges). The roster of names in the lottery were replaced every five years.
The main organs of government were known as the the maggiori. They were: the twelve good men, the standard bearers of the gonfaloniere, and the signoria. The first two debated and ratified proposed legislation, but could not introduce it. To hold an elective office, one had to be of a family that had previously held office.