Not sure about kuru specifically, but other prion diseases can be acquired through tainted meat, e.g. BSE.

Well normally all skeletal muscle contains nerves which might have at least some of the proteins that could flip. But in this case you wouldn't want the muscle to activate, it is like the purest kobe veal kept in a box so that it's muscles never even had to work once. I have often joked engineer meat is like kobe veal, kept in a box and fed nothing but beer. Maybe soon I can test my theory.

Nope. In fact the highest concentration of prions is in your tongue.