Apache Kafka is a widely used, distributed, open-source event streaming platform, which is available as a basic reference architecture for IoT use cases of the Autonomous Systems National Laboratory and other initiatives in Hungary, e.g. related to development of cyber-medical systems. This reference architecture offers a base for setting up a multi-node Kafka cluster on a Hungarian research infrastructure, ELKH Cloud. However, the capacity, accessibility or the availability of a given deployment using a single data center might not be sufficient. In this case Apache Kafka can be extended with additional nodes provisioned in the given cloud, but our solution also enables the expansion of the cluster by involving other cloud providers. In this paper we present our proposed approach for enhancing the existing basic reference architecture towards cloud continuum, i.e. allowing the supported IoT use cases to expand the resources of an already deployed Apache Kafka cluster with resources