If the internal Commlinks and Cyberdecks are so readily accessible, then what's the point? It's one thing to be super covert and have a Cyberdeck hidden away that nobody can take away from you. If tugging on your ear lobe causes it to eject out the side of your neck, then your captors are still going to take it away.
And if everybody thinks that technology is just going to keep getting smaller and smaller that there's no worry about fitting anything, then why aren't all these things little tiny grains of rice you just get injected and forget about entirely? Why are Cyberdecks described as a Tablet sized piece of equipment, when they should obviously be a fleck of sand in the corner of your eye. You should be able to stash a million nu¥en worth of Fairlight merchandise on the head of a pin.
Or... you give your players options, trade-offs, and ramifications for choosing one thing over the other. If you want an easily concealed device implanted, then the trade-off is that it's not readily accessible, and you can't really walk around with a USB thumb drive sticking out your ear. If you want to have something easily modified and adapted, you're gonna need to keep it in your backpack instead.