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If you want to delve into licensed material, the writers behind the Dark Heresy RPG had a rather cool idea called the "Temple Tendency" - basically a hidden network of zealots who wish to return to the Vandirian ways of the Imperial Cult, who have also managed to infiltrate certain key positions in the Ecclesiarchy.
Might be suitable inspiration for you? It at least sounds like something that could fit, following your description of that world.
As for allies, I'm not sure Vandire had any, actually. He just bullied everyone into submission. That's not to say that his puppet senators might not still be subjected to a trial, regardless of how they actually felt, of course. In fact, the 2E SoB Codex does mention that the coalition "issued a summons for the High Lords to account for themselves and to indict and execute Vandire as a traitor" before the siege of the Imperial Palace began. That said, Vandire simply dissolved the Council of High Lords shortly after having heard of this, stripping the puppets of what little authority they held, so who knows.
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