Hey,
I am not sure if S2D can be deployed on a single machine and be scaled out to a 2 node cluster. You can use alternative shared storage solutions. As an example, StarWind VSAN can be used to deploy a single node cluster. You can scale to a 2 node cluster as soon as you will have additional node available. The only thing, you should run cluster validation after you have both nodes added to the cluster. The following guide covers 2 node cluster configuration:
https://www.starwindsoftware.com/resource-library/starwind-virtual-san-installing-and-configuring-sql-server-2019-tp-failover-cluster-instance-on-windows-server-2016/
Cheers,
Alex Bykovskyi
StarWind Software
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