Notwithstanding the provisions of Kan. Stat. Ann. §§ 12-2616 through 12-2629, and amendments thereto, any municipalities as defined in Kan. Stat. Ann. § 75-6102, and amendments thereto, located in and including Douglas, Johnson, Leavenworth, Miami and Wyandotte counties, may qualify to enter into agreements to pool their sickness and accident related liabilities in accordance with Kan. Stat. Ann. § 12-2617 et seq., and amendments thereto, with municipalities located in other states if such a pool was formed on or before January 1, 1990. Any investments held by such pool shall be held in an entity described in Kan. Stat. Ann. § 12-2622, and amendments thereto. In the event the law or laws of any other state in which a member of the pool is located are inconsistent with or contrary to any provision of Kan. Stat. Ann. §§ 12-2617 through 12-2626, 12-2628 and 12-2629, and amendments thereto, the law of the state with the more stringent requirement shall apply.