Red-eye gravy is another example of pork and coffee together. It's delicious. But, like the other examples, no milk.
Poking around online, I do see some non-traditional red-eye gravy recipes that also add milk.
Bacon and chocolate is also a well-established pairing.
Honestly, assuming you can deal with the oiliness, I think bacon flavor would work great in a coffee drink.
Do you have a recipe?