The procedure provided in this section for adoption of a charter may be used in any county in lieu of the procedures provided in Section 1 of this Article, and a charter adopted pursuant to this section has the effect of a charter adopted in accordance with the provisions of Section 1. The board of county commissioners of any county at any time may appoint a charter board. Said charter board shall be registered voters and shall consist of an uneven number of members, not fewer than five or more than nine. The board of county commissioners shall appoint a charter board within thirty days after receiving a petition signed by five percent of the registered voters of the county or by ten thousand voters of the county, whichever is the lesser number. If additional charter board members are nominated by petitions signed by three percent of the registered voters of the county or by two thousand registered voters, whichever is the lesser number, delivered to the board of county commissioners within sixty days after the charter board is appointed, the board of county commissioners shall call a special election not less than thirty or more than ninety days after receiving petitions, unless a regular election falls within the designated period. The appointees of the board of county commissioners and those nominated by petitions shall be placed on the ballot in alphabetical order without party designation. The voters may cast votes for, and elect a number of nominees equal to the number of charter board members originally selected by the board of county commissioners, and those so elected are the charter board. The charter board, within 18 months from the date of its appointment, or if there was an election for some of its members, within 18 months from the date of the election, shall present a proposed charter for the county to the board of county commissioners, which shall publish it at least twice in one or more newspapers of general circulation in the county within thirty days after it is presented. The charter shall be submitted to the voters of the county at a special or regular election held not earlier than thirty days or later than ninety days after publication of the charter. If a majority of the votes cast for and against the adoption of the charter are in favor of its adoption, the charter shall become effective as the charter of the county on the thirtieth day after the election or such later date as shall be specified in the charter.