If you are so worried about the zombie turning on you, why not just put them on auto from the get-go, or implant the talisman right after completion of the technique itself (prior to storage, but after the sacrifice has been made and such).
Of course, there are loopholes to loop around those as well, such as the emotional state of the zombie reflecting their ability to be controlled. And as for regeneration:
"Minor" (some scratches or bruises, nothing too bad) - no turn needed
"Minor Moderate" (broken limbs or cuts that would cause bleeding, more than a paper cut, no bleedout danger however) 1 turn
"Moderate" (Loss of a hand, foot, or similar appendages, getting run through by the average sword or getting smashed by certain levels of taijutsu) 2 turns
"Minor serious" (Loss of a limb, serious run throughs with swords of ninja swordsmen size, 'knockout' blows such as hidden lotus) 3 turns
"Serious" (Death were they still alive) 3-4 turns
"You just got your life knocked out!" (Complete obliteration, such as when Madara brought down the meteors, or dust release victim) 4-5 turns.
Just suggestions.