Reconfiguring a VxRail cluster with an external vCenter back to using an internal vCenter?

Is it possible to configure a VxRail cluster back to using an internal vCenter without having to reinitialize & reconfigure the whole VxRail cluster from scratch?

We are planning to shrink our VMware footprint due to excessive Broadcom license costs.  We currently have an old Dell R630 3:2:1 cluster (ESXi 7 Dev/Test environment) and a VxRail S570 cluster (ESXi 8 Production environment) both controlled by an external vCenter (vSphere 8).  The VxRail was joined into the external vCenter when it was deployed.

Our goal is to decommission the R630 cluster and get to a self-contained VxRail cluster environment for the remainder of it support lifetime (2027).

Moving everything off the VxRail cluster to the R630 cluster temporarily just to reconfigure it, or restoring VMs from Veeam backup, seems extremely time-consuming and risky.