I tried to do the Synod of Gawnfall without the Lustlord temples expansion, to free up that ProN while saving for the pre-war ruins opening. If you have most of the other preparations, it turns out you can still win everything: moderate reforms, all best results in major and minor votes (except the unavoidable Ardford ban second best), and the Annah score high enough for return to Stineford (you get 7).
Requirements: pass all the hidden stats, RP and quest checks, Sexual&Purity research done, invested in Order of Silence 50k, sanitation mages, Ivalan Bank and Lustlord Statues, Jhenno's help in Religion.
Day 1: Hester -> shape the world, Esmera deal, Kerannii no deal
Day 2: Jhenno -> Succubi vote
--Excommunication vote: Sarai -> normal, Simon -> silent, Carina -> talk against Annah, Success -> olive branch
--Unification vote: Sarai -> target Nabith, Simon -> Church Leadership
--Succubi vote: Yelarel -> discourage, Sarai -> all in, Simon -> Appeal to Esmera, Iris -> talk
Day 3: Yelarel -> moderate reform
--Ivalan succubi vote: Simon -> silent, ask everyone but Hester to support succubi joining
--Succubi join motion: Sarai -> normal, Simon -> appeal to Nabith, Riala -> talk
--Unpeople vote: Sarai -> normal, Simon -> silent, Robin -> don't talk, Yelarel -> light approach, Esmera -> refuse
--Tak'kan Vote: Sarai -> normal, Simon -> convince Kerannii
--Purity vote: Sarai -> support Kaskia, Simon -> silent, Yelarel -> let Andra talk, Qum -> show skill, Herin -> change standard
Day 5: Elleani -> Fucklord vote, Tyna -> Fucklord vote
--Fucklord vote: Herin -> speak against, Sarai -> influence Annah
--Promotion vote: happens
Minor Issues: 16 Sarai influence is enough to boost every issue, distribute the helpers to get the desired outcomes.
That should free up 750k ProN for more profitable investments.