Although I use mainly tube at work, I mix layher and surelock all the time when I'm erecting system.. not that arsed who actually needs justification ?? in fact its amazing where system will go, we do hangers, cantilevers all the time with it, as well as T and F... its very versatile although I always use tube mostly... saves the 10ft legs for the rest of the lads..lol..
Layher state that their materials shouldn't be mixed with any other manufacturer's modular system components. Your actions null & voids the Layher product indemnity insurance. Reckless actions & for what?? To make a bit more money?.......if an accident occurs the manufacturer ( Layher) will not cover their products.......I am sure your clients will be thrilled if they knew & understood the ramifications of your actions?