So getting that - woman of Irori, whose name Keltham has forgotten, but who'd be in the transcripts - paying her to assassinate Abrogail Thrune temporarily, would not knowably be enough, even if he also managed to get an assassination on Jacint Subirachs.
Basically, Keltham has two months into which to destroy Cheliax, or deploy some other solution to his problems, if he doesn't want his children ending up in the Boneyard.