The recipe sounds gorgeous! But, I make make one alteration. Salt pork or bacon doesn't sound like it's going to be a right base for black beans...it would need something to make it Caribbean or Cuban-tasting (maybe goat meat, LOL -- no joke, try curried goat meat!). But definitely the onions will be included!
However, you HAVE managed to give me a great recipe for the northern beans I also picked up. Somewhere in my travels I collected a recipe for the famous House of Rep great northern bean dish and since I never made it, I haven't a clue what it said, except I do recall boiling potatoes to the point of pulverising them and turning the water white.