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