I roasted a hunk of pork shoulder, and I always get stuff to make cubans. But I figured it's not that different to make banh mi sandwiches too. As far as I can tell, the meat can be anything - the main thing is to have pickled carrots and radishes, as well as cilantro. The store didn't have any daikon, so I pickled turnips instead - seemed to be pretty similar.
Anyways, they didn't have any Vietnamese bread, either, so I got an italian loaf and griddled it in olive oil. Smeared both sides with mayo, then pork, pickles, pickled veggies, cilantro, and slices jalapenos, with a pour of that Japanese BBQ sauce they sell at Costco - basically a sweet soy sauce. Not bad.