Hi Tim,
You could change the meta data of the clip so that it plays back at 25fps in Cinema tools. The footage will still be in HD, but then you can compress that using Compressor without changing the frame rate.
The picture and audio will be ever so slightly sped up, but Iunderstand that this what is done to get 24fps feature films into a 25fps PAL friendly format.
Will
As I wise man once said after an all night edit, I hate this shit!