Blake's knowledge of the review of Dawe is almost certain since it appeared in the same issue in which the plan for the Chalcographic Society was published.
With its focus on the Chalcographic Society, the Public Address was begun no earlier than the late spring of 1810, and I will suggest below that Blake likely worked on it through early 1811.
In his 1810 Memoir, Hunt described his own detractors as "poor reprobates," (53) and as the final fate of the Chalcographic Society was being determined, Cromek also referred to himself in a June 24, 1811 letter as "one of 'God's Elect'--i.
The Context of Blake's "Public Address": Cromek and The Chalcographic Society.
Read, "The Context of Blake's 'Public Address': Cromek and The Chalcographic Society," Philological Quarterly 60 (1981): 69-86 and "The Rival Canterbury Pilgrims of Blake and Cromek: Herculean Figures in the Carpet," Modern Philology 86 (1988): 171-90.