John Meagher prepared What A Nuisance (1985), Efficient won for Graeme Rogerson in 2007, Robert Hickmott celebrated success with Green Moon (2012) and Almandin (2016), while Rekindling (2017) and Twilight Payment (2020) were both trained by Jospeh O'Brien.
None of Williams' winners have been as large a price as Changingoftheguard, a $61 chance, but Lees is happy with the son of Galileo and is happy to overlook his sixth placing as topweight in the Geelong Cup.
"He just really struggled on what was a 'gluey' track at Geelong with a 60 kilos," Lees said.
"I'm really pleased with his work. He's had a good foundation, he's been up since June, and I think he's in good order.
"In a proper run two-mile race with no weight and a good on speed jockey, I think he'll run a bold race."
Changingoftheguard, who drops to 53kg, will start from the outside barrier in the 24-horse field with Tim Clark to take the ride.