As an alternative to Section 47621, an elementary school that meets the requirements of Section 47620 may apply to become a charter school by petitioning the State Board of Education. Under this section, the petition shall be signed by not less than 50 percent of the school’s currently employed teachers. All other procedures and requirements, other than those prescribed in subdivision (a) of Section 47605, that are contained in Chapter 2 (commencing with Section 47605) and Chapter 3 (commencing with Section 47610) are applicable to a petition filed pursuant to this section except that references to “governing board” shall mean the State Board of Education.