Thanks for all the help and suggestions! I found a hack workaround:
Import the .MTS to FCP, conform it to 24 in Cinema Tools, drop it into a 24 frame sequence, apply to correct TC to the sequence time, and modify the sequence to playback 99.9% slower. It works. Frames blend horribly, but it works. Also, FCPauxTC works as well, either modifying the original quicktime, or exporting a self contained quicktime. Thanks again, Jason