I always do a triple batch and freeze flat. Then I can take out what I need for whatever recipe I’m making.

That should be fine!

If you really want to avoid the dishes, you’re welcome to mix it all together in one bowl. However, I don’t really see why you think it doesn’t make sense. It’s much easier to incorporate eggs into a meatball mixture if they’re already whisked before adding. If you’re a seasoned cook, you could crack the eggs into the meat bowl and whisk them to the side, but that’s not something we’re going to suggest to someone who’s making meatballs for the first time. Same with the breadcrumb mixture – the point is that these ingredients are already mixed together before mixing with the meat. Similarly to how you would add ingredients when baking by mixing the dry ingredients, then the wet ingredients, and mixing them together to form a batter. Hope this helps! :)

Yes, buying ground pork and just adding extra of the seasonings would be fine! I would also add some fennel seed to give it that sausage flavor if you have any!