Whenever the affiliate companies of any joint underwriting group described in Kan. Stat. Ann. § 40-273 issue policies in this state that obligate more than one (1) insurer, severally or jointly, the solicitation of such policies must be accomplished by a licensed resident agent for at least one (1) of the companies assuming direct liability on the risk: Provided, That such policy must be countersigned by a licensed resident agent for each company assuming direct liability as provided in Kan. Stat. Ann. § 40-246: Provided further, Such countersignature requirement may be accomplished by means of an endorsement on which the signatures of licensed resident agents of all companies assuming direct liability on the policy are placed.