There is a huge number of airline and private operators using ipads. They have done leg work, sorted the issues, designed various mountings etc etc etc etc.
EK has to reinvent the wheel - for whatever reason.
Get creative. Most pilots have ipads. If they went with ipads they could save a bundle in costs. Pass half the saving back to the pilot if he uses his own device. Both sides are happy, save money with the added advantage that people take better care of their own belongings.