You may be able to slide the plywood beneath the walls without doing anything but slightly lifting the walls. By notching out the area where the brackets are, the flooring can slide beneath the walls. You may need to join the flooring in the center of the floor or else mismatch the pieces.
Make sure your new floor joists are placed properly to take this into account. The new sections may then be installed from the center and under the walls. New brackets may be needed to secure the walls to the new floor.
Good luck on your repairs!
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