Also I realize my way of dealing with not having a Crowley ingame for the summoning last time could apply here: they could swap corporations but that might be too much idk?

How would that work exactly? Like would he only grab Crowley's soul so Aziraphale ends up speaking in tongues like when he borrowed Madam Tracy's body until Crowley is sent back to his own body or something more like Crowley ends up in Aziraphale's body in school and Aziraphale becomes Crowley in Hell?