Hi you do Not need to wipe anything , we just turned off the new 8.7 virtual servers , and setup 2 new 8.6 srm virtual servers, registered with vcentre and installed the SRA , we only have 4 protection plans so it was very quick to rebuild these ,  the virtual servers are still on the same replicated nimble volumes . So they get picked up by srm once you add the volumes / storage back into SRM

hope that answers your questions !