Here is what come to my mind should be action plan :
Create new vmotion VMK vSwitch1
Create new vSAN vmk vSwitch1
Create VM port group on the vSwitch1
Hopefully this will bring up the vSAN
Once vSAN is up , bring vCenter UP
From vCenter console , login & change vCenter IP from cli ? not sure how to do that, i have done from GUI
Bring the other vms & do same