Perhaps something as simple as a red stop bar,one way at the end of A,might be all that's needed.Put the red runway ahead marking as well at the Runway stopbar,and you have 2 extra clues
The girls can stay in LKF.
Milan,Tenerife are other accidents you may like to read about( NoSMR).Or Gatwick when and aircraft landed on a taxiway (green centrelines)after a SRA.Gatwick was interesting from a human factors point,but in your book it's incompetance.
However if you guys say it was incompetance then so be it.You haven't mentioned the Tower not spotting it either out the window or on the SMR,until it rolled.