LVDS over non-twisted flat ribbon cable

I'm lacking the experience of LVDS over flat ribbon
cable that should be twisted, but is not. Different
pairs will couple with the next and with the outside
depending on frequency and length, but by how much ?
The motivation for the question comes from the rather
limited number of possible crimping locations a
twisted ribbon cable provides. Whereas a flat ribbon
cable can be crimped at any arbitrary millimeter.

I'd be using it for short runs, below 0.5m alltogether

Rene
.