Section 6A. Notwithstanding other provisions of this chapter, a credit union organized under the provisions of this chapter and insured by the National Credit Union Share Insurance Fund may exercise any power and engage in any activity that is permissible for a credit union organized under the provisions of the Federal Credit Union Act in accordance with regulations promulgated by the commissioner pursuant to this section; provided, however, that any such activity is not otherwise prohibited. In determining whether or not to authorize any such activity, the commissioner shall also determine whether or not competition among credit unions will be unreasonably affected and whether public convenience and advantage will be promoted. Said commissioner shall promulgate regulations necessary to carry out the provisions of this section. Except for emergency regulations adopted pursuant to section 2 of chapter 30A, any such regulation, or any amendment or repeal thereof, shall, after compliance with all applicable provisions of said chapter 30A except section 5, shall be submitted to the general court.