[DCP-o-matic] Force re-encoding of DCP

Hi all. Is there any way to force re-encoding of a DCP? We have a DCP which has an illegally high bitrate, and would like to re-process it to re-encode the frames at a lower bitrate. Usually, where you don't alter the image (crop, colour conversion etc) DCP-o-matic is clever enough just to repackage the original J2K frames without re-encoding. But is there any way to force it to do a re-encode? Or can anyone suggest a workaround? A good way to export to an image sequence and then re-import that for example? Many thanks, Jim