Transfer manged devices to new MDM server

We have recently subscribed to SMCaas. As a result we need to reconnect more than 150 clients to a new MDM server. At the moment my process is to decommission them from SMC on prem and then enrol them manually afresh on the new SMCaas instance.

Is there a way to automate this at all? It would be great if I could use a task on the old SMC server to redirect them to the new SMC server!

Thanks all