I think the question is, could the files for the 25GB version be posted with the video m2ts stream removed so people could download that and use the multiAVCHD method to patch in the MKV video. That way they can make the 25GB discs from the MKVs they already have without having to essentially re-download the entire video/audio portion.
Of course, if the video was compressed for the 25GB version, that won’t work, but if the video is untouched from the MKV, it should, right?