To be honest, I really doubt there's a "grand conspiracy", at least nothing that goes to Trump.
It's pretty funny because the crowd did exactly what Trump's speech incited them to do and then... nothing. They went all in on throwing their lives away expecting that their leaders had some plan, then Trump went home and watched the riot on TV. The CHUDs actually succeeded in taking the building and disrupting the vote and their leaders did not pick up the baton and run with it. No insurrection act, no "storm", no cavalry riding in to secure a coup, nothing. They milled around for a bit and vandalized the place until enough cops showed up to clear the building.
They got hung out to dry when their supposed revolution turned into little more than a public tantrum to assuage Trump's ego. They actually believed his BS, the absolute morons, and found out the hard way there was no plan.
The cases of conspiracy we've seen include pre-existing fascist groups that had a history of engaging in organized political violence under their own volition without external leadership. Proud Boys, Oathkeepers, and Q cranks have a long history of engaging in this kind of violence without the need of an outside instigator leading the charge. I imagine these groups would be open to coordinating with larger profile right wing leaders, but that's not necessary to explain what happened in this case.
Trump and other leaders of the fascist right were definitely whipping up the mob and pandering to their sense of grievance, but I don't think that necessarily means that they actually had any plan.