Bones of Burgos
Order of battle here, but no unit strengths: https://en.wikipedia.org/wiki/Hanau_order_of_battle#Order_of_battle
Wiki gives the corps-level figures from Jean-Pierre Mir in his "Hanau & Montmirail," 2009, but Mir refers to Jean Tramson, "La Bataille de Hanau," 1990, so perhaps Tramson would be useful for you?
Yes, anything more detailed than wiki would be useful. I've tried with Leipzig numbers proportionally reduced with officers casualties but not sure how much sensed this method is.