I have exported the FCP timeline using the Quicktime Export function with the same settings as the timeline. Once you have that, import the QT file into Flash 8, apply the size, quality and skin settings. Once it is imported to the stage, you can publish it as a .swf file. However, you’ll need to give the .flv, .swf and skin file to your client. I believe they’ll need all of those to playback properly.
Hope this helps.
Dave