minerals aren't stored in buds (proven by research that a flush does nothing relative to mineral content of buds), so don't worry if you don't get a full fade. If it's sucking from leaves, it's not "overfed" which is the primary concern, if any.
an extra day isn't going to make much of a difference. So, have fun if you want to.
Plants generally maintain the same water content -- rate of transpiration is cuase of drinking more or less (ignoring growth, but proportional to that too). if it wilts, no matter if you apply "good" stress it's not going to going to be generating much cellular growth with a lack of water, ignoring nutes for a bit due to timeframe and leaves having enough to provide for short term. Even less with non-green leaves unable to produce enough ATP. (krebb's cycle)
if the plant is about to wilt or wilting, it may speed up drying time but otherwise, the plant will still be ~80% water. If a faster dry is needed due to extremely high humidty environment or similar context, then sure... might be a good idea.
i'd sugges the KISS principle.. "Keep It Simple, Stupid." Not much growth can occur in 24 hours anyway... 24-36 hours of darkness before chop can increase trichomes on outside of plant -- essentially you keep what would normally evaporate from heat/light. there is research that backs that up. still what can happenin 24 hours is a very small piece of the total pie for a plant that took ~8-9 weeks to form the buds.
about the 24-36 hours -- incomplete research.. for example.. what is lost in that darkness? each day a pot plant doesn't get the minimum DLI to maintain mass, it shrinks... it loses mass. Just as we lose mass if we stop eating for a day. the existing research made no attempt to quantify cost of the extended darkness. the increase of THC% could be augmented artificially by the denominator (total mass) is also shrinking over that time. so, it's kinda double dipping on the percentage calculation without accounting for the loss.
There's so much trash out there... if there's no comparison to a control group, it's hard to have confidence. ppl often think what they do has a positive effect regardless of any reason to come to that conclusion.