I just realized "AD Caster" is an extremely subjective term. That was my fault.
The way I thought of "AD Caster" is basically like a mage that scales off AD. Mages are ranged and cast spells from a distance. Most of these champions are like Ekko or Fizz, a melee assassin-fighter type champion depending on how you build them. Not a mage or a "Caster"
The only "AD Casters" I would consider would be Urgot and Jayce. Urgot is basically an AD cassopeia and Jayce has the range and utility of a mage. None of these champions you listed would use Essence Reaver, but Jayce and Urgot would both benefit off this item.
The ADC casters that were mentioned (Besides Lucian, Sivir, and MF who are extremely auto-attack reliant) I suppose could fit this description but very awkwardly being half auto attack reliant and half ability reliant. Take Jayce and Urgot for example, their auto attacks are not that good but the auto attacks of the ADC's mentioned (minus Jayce) are extremely potent.