Nigel,
I would,as a minimum, require complete 360 degrees internal insulation and FST barriers just as a starter, however I have strong and ongoing doubts whether that would fix all safety and FST issues. I would, of course, immediately ground all 787 A/C and if not adequately fixed ground it permanently. Not using epoxies might be the best and permanent way to go just as off shore oil platforms were after the dreadful Piper Alpha fire that I am familiar with.