Defintely try it in your lab, but I believe what you will find is that when you use the -r with the root path, it remembers that it was not up when you deleted it so it doesn't activate the IPs when you create it.
When running dr configure or resync, I save a copy of snapmirror.conf first. vfiler dr updates snapmirror.conf to 0-59/3 for 3 minute updates which you might not want, especially when the mirror schedules for those volumes in the vfiler might already be set. So if no new mirrors, it's easier to write back the original snapmirror schedule.
Also, dr configure will initialize all mirrors from scratch, so if there are any existing mirrors, then I use dr resync instead to not have to re-init. For new vfiler dr setup with several large volumes already mirrored, we manually mirror the remaining volumes in the vfiler then just do the resync to get it running.