I lack knowledge to advise about the technical, so I only can bring up general questions.
Another issue is security. Customers want ease of connectivity, but they also want immunity from malware and hackers. Which is better for this, EBOX or your design?
If the computer is stolen, can it be located by services like those which track down stolen smartphones? Is EBOX better for this, or your design?
I have a PCI-e card in my laptop. It is small as 3 postage stamps. Can your entire design fit onto such a small card? Can you make the correct size antenna for the card, to serve all wireless frequencies? Can you make the antenna operate properly in a computer?