Changing speed with 50i movies????

I get horrible results when I use the motion menu to change the speed of interlaced movies. Although I think it is clear what's the problem I'm at a total loss how to get this fixed.
Can anyone give me a workaround or proper settings or whatever to get this work right?
I think the problem itself is very easy:
"The goal with time remapping is to make a particular frame from your media file
occur at a specific point in the Timeline." (from the Final Cut Pro User Manual p.345)
So that means that if I slow down an interlaced video, with fields A B C D E F in this order (that is, 3 frames) at half speed, what is shown to the viewer is
A B A B C D C D E F E F
This will look terrible of course
And, even worse, playing backwards at 100% will give you
E F C D A B
Anyone knows how to get this fixed? I can even imagine a workaorund going to a 50p format first, and then downconverting back to 50i. But so far I could not get anything work.

Hi
AFAIK slowing down 50i video (I guess interlaced PAL) 50% will give you the smoothest playback but you'll loose half of the resolution, because each field will become a frame.
With your A/B C/D E/F fields example, you must get A/A B/B C/C etc
I have read *several times* the slow motion chapter of my THE DVX BOOK copy, but I would love to hear something that confirm this from the pros around here.
  Alberto

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