Thank you for your comments.
Let's clarify more regarding the security:
I agree that securing BYOD can be a nightmare. If you put your company data in devices it is very complicated and even nearly impossible to effectively secure your company data with all the variety of devices, OS's, and locations. But if you will be able to keep the data in your company and just allow the users to access the data from remote devices without the ability to download the data, then the security task can be simpler. In this case, the security task is just to make sure the gate to your data is secure enough, e.g. two-factor authentication and making sure passwords are not kept on devices. Of course you still will need to deal with security but its possible to make it a more reasonable effort.
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