Wholewheat and plain white pasta aren't harmful and are easy to digest.
Most dogs are lactose intolerant so cheese and milk lead to gas, loose stools and abdominal discomfort. Cheese also tends to be high fat, which would not be good if he has pancreatitis. I don't recommend dairy products for dogs.
Pigs ears are digestible if chewed on and ingested in small pieces. But most dogs tend to swallow large chunks, which can upset the gastrointestinal tract. Pork in general tends to have a high fat content and is a meat that is more likely to cause stomach upset. That's one reason it isn't used in commercial dog foods. I would probably avoid these for him knowing he has a history of stomach upset.
I am not familiar with Schmackos or Bonios, but from some quick research they look to be dog treats. Schmackos look to be of the soft, moist, chewy type treat. These contain lots of artificial colors, preservatives, salt and I don't recommend them. Bonios look similar to a milk bone, and while not necessarily bad too many can lead to stomach upset and weight gain.
It sounds like your fellow is fed all sorts of things besides dog food, including table food, treats and chewing snacks. In many cases, especially as dogs age, that is a recipe for disaster. It interferes with proper balanced nutrition, leads to weight gain, picky eaters, nausea, diarrhea and possibly pancreatitis.
I would find a high quality, low fat dog food that he likes and feed that as his primary diet. If you must give him table food it should be veggies like carrots, green beans and maybe peas or fruit like watermelon, cantaloupe, banana, thin apple or pear slices, or kiwi. And even then limit the amount he is given.
I understand that you love him and want to share with him but poor nutrition and too many treats will cut short his life and affect his quality of life in the short term.