Forcing PLAINTEXT in SECURITY_PROTOCOL_MAP for created listener

I'm trying to create ConfluentKafkaContainer in which I need to have an additional listener. The problem is that I require this listener to use SASL_PLAINTEXT not the plaintext. I see that KafkaHelper pushes PLAINTEXT for this listener into the security protocol map, even if I manually defined it as SASL_PLAINTEXT. Is there a workaround for this, or is there an idea to have this working?

https://github.com/testcontainers/testcontainers-java/blob/6e104da1d6e8a4188451f556e9c7cb4ce8eb3164/modules/kafka/src/main/java/org/testcontainers/kafka/KafkaHelper.java#L81C11-L81C59

Network network = new Network();
var kafka = new ConfluentKafkaContainer(DockerImageName.parse("confluentinc/cp-kafka:7.6.0"))
                .withNetwork(network)
                .withNetworkAliases(HOST_ALIAS)
                .withExposedPorts(9092, 9093, 9095)
                .withEnv("KAFKA_INTER_BROKER_LISTENER_NAME", "BROKER")
                .withEnv("KAFKA_LISTENER_NAME_PLAINTEXT_SASL_ENABLED_MECHANISMS", "PLAIN")
                .withEnv("KAFKA_LISTENER_NAME_PLAINTEXT_PLAIN_SASL_JAAS_CONFIG", "org.apache.kafka.common.security.plain.PlainLoginModule required " +
                        "username=\"admin\" " +
                        "password=\"admin-secret\" " +
                        "user_admin=\"admin-secret\";")
                .withEnv("KAFKA_LISTENER_NAME_TC-0_PLAIN_SASL_JAAS_CONFIG", "org.apache.kafka.common.security.plain.PlainLoginModule required " +
                        "username=\"admin\" " +
                        "password=\"admin-secret\" " +
                        "user_admin=\"admin-secret\";")
                    .withEnv("KAFKA_SASL_ENABLED_MECHANISMS", "PLAIN")
                .withEnv("KAFKA_AUTO_CREATE_TOPICS_ENABLE", "true")
                .withEnv("KAFKA_SASL_MECHANISM_INTER_BROKER_PROTOCOL", "PLAIN")
                .withListener("kafka:9095")
                .withEnv("KAFKA_LISTENER_SECURITY_PROTOCOL_MAP", "BROKER:PLAINTEXT,PLAINTEXT:SASL_PLAINTEXT,CONTROLLER:PLAINTEXT,TC-0:SASL_PLAINTEXT");

Start with KafkaHelper.java at the linked line and trace the withListener("kafka:9095") call. Compare how the listener security protocol map is assembled with the explicitly supplied KAFKA_LISTENER_SECURITY_PROTOCOL_MAP value. Done means an added listener can retain SASL_PLAINTEXT rather than being forced to PLAINTEXT, while the existing listener configuration remains valid.