I'll soon upload a longer clip with the new wipe. In addition to the 'Take her away!' hand and voice slow down, I additionally toned down previous Vader's movements like in Jaitea's video clip.
I went for the diagonal wipe to match the diagonal wipe afterwards. Since the new wipe is much faster than the previous crossfade, the two wipes are no longer just 2 seconds apart, so it looks OK. The only thing is the quality of the wipe: it's ok, but not great. I need to check those luma files Kdenlive uses...