I have done it.
I made sure the diameter of the cable was less than the height of the motherboard standoffs and I marked a path on the backplate so that the cable would not press against any leads of the board(A soft sleeving helps).
After that just route the cable along the path and check if the cable clears the length. Place the mother board and do a rough preliminary test by making sure the cable is not getting twisted and bent at uncomfortable angles.
I used a mix of cable ties and electrical tape to fix it onto the backplate.
I was very calculated and took a lot of time to set it up and a word of warning though
DO IT AT YOUR OWN RISK.
Before:
After: