I have not worked with IBM VASA so below are my thoughts on this.
Since you have already set up one cluster, it should not be an issue to setup another cluster. However, you should test this in a test environment before doing it in production if you are not sure. You can always raise support case with both IBM and VMware support to get the appropriate configuration details to set this up.
VMware and the Storage Provider confirmed that this is supported and I have already implemented it.