The energy for a post-harvest reveg comes from the carbs stored in the roots, so products with gibberellic acid should help to convert that to usable energy. There will be very little transpiration, so you won't have to water as often as you were in flower.
Preferably your plant will have growth points at the bottom of the plant, that have not received enough light to start flowering. If so, you can remove the flowering tops, put the plant back into veg, and it should handle itself >90% of the time.
If all of the growth points have flowers, things get a little more difficult. Again the youngest growth points will be the quickest to reveg, so hopefully you have some little buds that look like they've only just begun flowering. Like you said, give them time and treat them like giant seedlings, and you should be good.
Can't stress enough tho, that sometimes a bug or infection takes advantage of the weakened state and plants can be lost. It's important to have a decent low-stress ipm.