My vacuflush had one pump per head. Are you certain you only have one pump? I ask because when one of our pumps was accidentally turned off, it behaved exactly as you describe.
In your case, it seems that the obstruction is pretty resistant to moving forward, so what about trying to pull it back? Could you release vacuum at the pump, then rig a shop-vac to the toilet and try sucking the obstruction back out the way it went down? I wouldn't want to be your shop-vac under such a scenario, but I suppose it's better than getting it all over you.
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