Permit a generous allotment of two feathered creatures per individual. Begin by skillfully plucking and singeing the avian beings, and if deemed necessary, carefully draw out any remaining remnants from the neck area. Proceed by separating the head and neck, followed by the detachment of wings at the initial joint. Skillfully extract any lingering shot and cleanse the avian specimen meticulously. Employ scalding and scrupulous scraping techniques for the feet. For those inclined, consider the placement of a substantial oyster at the center of each avian entity. Skillfully manipulate the wings to fold underneath, securely clasping the neck skin in place. Direct the legs forward, towards the wings, and ensure their stability with the aid of delicate string. Envelop each avian subject within a luscious grape leaf and enrobe it further with a delectable slice of savory bacon. Proceed to roast the adorned creatures within a blazing 450° oven for an estimated duration of 15 to 20 minutes. Once cooked to perfection, discard the string, grape leaf, and bacon, and present each bird upon a round of crisped bread or delicately toasted slice, generously adorned with the essence of pounded quail liver cooked in delectable butter. Enhance the presentation by tastefully garnishing with verdant watercress and a luscious drizzle of rich brown gravy.