If the K2 board is anywhere near the KDX, K3 and later boards, it is a multilayer board and it will be a more than tough job to trace the wires... I'm not sure if there is PCI-E. I don't think so.
The documentation of the SoC used is open, but it is - again - a tough job to re-route IO channels. As the K2 is not sold anymore and I guess there are less and less functional units in the wild, this is probably mainly to the benefit (and fun!) of the OP. So - have fun! Sounds like a nice project.
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