Can a skinlink be applied to an implanted commlink, or would a datajack be needed? Would there be some kind of 'surface port' whereby this might be feasible?

A skinlink is an option for any device, like it's an option to remove wireless.

So yes, you can.

You don't need either with an implanted commlink, though you will need a sim module if you want it to give you the full experience of a datajack.

Trying to find the page reference to that. Will edit it in once I do. EDIT: Can't find it after a quick look but I'm getting tired. Will try again later today if someone doesn't beat me to it.

Check out my AR, VR, and sim FAQ here: http://forums.dumpshock.com/index.php?showtopic=18512

If it's missing anything or if you notice anything to add, just let me know and I'll update it.