Sent!
References to Darth Maul’s mother (Kycina) are taken out. Maul’s origin is presented as compliant to the Canon explanation (Sidious took Maul from Mother Talzin who is actually the mother). Dooku leaves the order in 42 BBY instead of at the end of the novel. Dooku scenes in the 34-32 BBY era are rewritten to reflect. Palpatine’s final words to Plagueis are changed slightly to reflect Rise of Skywalker.
The version I’m working in right now will remove some out of place EU references (such as the Bando Gora and Xanatos) and slightly extend the references to essence transfer already in the novel. In canon, Plagueis attempted essence transfer as he died. Sidious also survived post ROTJ with this technique. Surprisingly, there is already a allusion in the existing novel that Plagueis is attempting something when he dies.