The cushion can be removed but it doesn’t remove the seat pan - i.e. removing the cushion won’t allow access to the bolts, because all you can do is take off the upholstery and the padding, not the entire lower assembly.
I would think you can reach at least one set of the bolts - either the fronts or the rear. The one that is covered, you might have to look for a box-type wrench that will fit over the star type bolt head on the front. On the rear, you might be able to use a pass-through socket wrench to hold a Torx bit to undo them.
In the worst case scenario - if the fore-aft motor still works - you could apply power directly to the power pin for the motor to drive it. This is a procedure described in the factory service manual, not sure where the pinouts for the connector is described.