Winona Hartvikson and Lauren Barwick narrowly missed qualifying for the Individual Freestyle; three will go on to the Team Test.
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In the four-horse jump-off in the 1.50m CSI3* class on Thursday, the Irishman stacked the odds by making up 50 per cent of the lineup.
The Land Rover Blair Castle International Horse Trials are underway in Scotland, and the 4* is being led by the world eventing champion.
Friday will see Grades I and III Individual Test medals decided and mark the start of competition for Canada's four para-equestrians.
Collins had stayed on board at CEP to ensure a smooth transition to the new management group, Angelstone Events.
The exact dates in early September 2023 are still to be confirmed; the event will take place on the Snai San Siro Racecourse.
Vanessa Mannix (CAN) and Catinka 25, who won the $100,000 ATCO Cup last week, finished a very close second.
The fiercest Para-Dressage competition yet is set to begin in Japan, featuring 77 athletes representing 26 countries.
The 2018 WEG team of Lauren Barwick, Winona Hartvikson, Jody Schloss and Roberta Sheffield has reunited in Japan.
The CSHA will host the Cup classes at RCRA in Newmarket on October 10, and also a Showcase class for four-year-olds.