Sync with timecode 25p / 50 p mismatch problem

I am editing a tvc. 

Cam operator accidentally shot in 50p, sound guy recorded sound set to 25p (you know with the buzzy reference timecode track  on mono 2 that you turn off in post)

So I am trying to sync via timecode  - but Final cut is having none of it! - it just stacks all the takes on top of each other at the start of the created  sync clip

does anyone have a workaround for  this that will save me manually syncing all the takes (which is slowly driving me crazy) ?