Rolleiflex 2.8C plastic collars removal

Anyone know how to remove the plastic collars from the shutter and flash rings? I would like to remove without breaking them if possible.

The shutter one has a retaining ring that can be removed with a spanner?

The flash appears to be riveted from the back. Meaning metal splayed out to retain the central bushing. There appears to be a layered assembly, top part and bottom part tied together, possibly another internal rivet or press fit. Some careful bending an a willingness to either reform or find a replacement for the small flange areas should work. The metal pieces inside the opening are to retain a Rollei-specific flash connector, I believe, so you could rebuild the part without the pieces and epoxy or solder a solid assembly?

Can the front plate be taken off without removing them? I just broke the shutter plastic collar.