It’s relatively easy to take an artificial skin mesh (already used and in-production for burn-victims), take a blood sample, break it down and filter it for genetic markers, soak the mesh in the markers and then graft it on.

Alternatively scientists could take scar tissue samples from the person in question, put the receiver in a growth medium and culture the tissue to grow over the nodes to a thickness just sufficient to transmit/receive a signal without causing a immune system response.

I understand the way the receivers typically work by directly touching tissue other than skin, but what most people don’t realize is when a muscle or nerve signal is being sent for volunteer movement the electrical resistance of an adjacent patch of skin oscillates, and this oscillation is unique per movement, easily detectable, and does not change much with age.