Clomid is two isomers, enclomiphene and zuclomiphene. Enclomiphene has a half life of around 12 hours and it's the isomer that blocks estrogen at the pituitary and zuclomiphene is an estrogen agonist and has a half life of around 5 days. Enclomiphene (Androxal) is just enclomiphene isomer.According to your longer half life reasoning it should be even less of a problem with Clomid. I don't follow your logic.
In practice, both isomers just stop occupying the brain estrogen receptor progressively, giving way to normal hpta regulation.
The phenomenon will be just as smooth whether you quit cold turkey or not given the enormous half life of Clomid.