Taking plant from outdoor to indoor is a potential major vector for pests. The only way I'll take clones from outdoors inside is if I can dunk them in Avid or Flouramite or some other nasty toxic stuff. You can't do that with a full plant.
Revegging a harvested plant is totally doable, and I've done it. It takes a while, and obviously you can't pick the plant clean, but it works. I've read that it can cause/promote potential genetic drift/mutations, which means it's somthing you don't want to do routinely, but I've never had any adverse results because of this -- probably cuz i've only done it a couple of times.