Have done it indoors on multiple occasions. Neither insane nor difficult to keep them inside while young. It makes for incredibly sweet, bonded pigs too, if you plan to keep them for breeders. My most recent house pig is a ~6 mo. old outdoor pig now, and he will always come stand on on hind legs at the fence to cradle his cheek in my hand rather than fight for the kitchen scraps I just dumped to the others.
I would be cautious about current outdoor lows in Oregon because of the damp. Pigs are fairly high maintenance when it comes to the temperature window they thrive in, and cold and damp can be dangerous even for adults. Any house temp will be fine.
They are inherently clean animals, and mine designate their own bathroom area as far from food and sleep areas as possible. Can usually be potty trained easier than puppies. It seems convincing to me that they require a different training mentality than puppies, though, as they are naturally a prey animal. Don't have the thought (like I believe is valid with dogs) of training them with a component of negative feedback, which is how canines will get training from their mom or their pack. The same actions with a pig seems to get processed like you're trying to eat them.
Don't use kitty litter for your suggested litter area; they will eat it and doubtful that is healthy. Wood chips/shavings, straw, or paper-based bedding. Don't skimp on bedding, and clean often or your house will stink. They pee a lot. Much like a cat, they will reuse any place they peed on your floor if you let them roam the house outside the pen before potty trained. But there is nothing cuter than a piglet that feels secure with you and their pen, and then released to start exploring your house.
I try to wean as late as possible, but commercial hog farmers would have weaned yours by now already. If you want to give milk, put it in a shallow pan to drink, like their water, or even better turn hog pellets into mash with it. It will be a huge mess, but they don't do well with bottles and tend to aspirate milk, which can lead to pneumonia. I've kept a runt alive that was too weak to drink from a pan, by using a nipple inserted at the back of his mouth on the side. But that was a lot of work for several days.
Until I know my hog nutrition better, I'm hesitant to skip hog pellets while they're young. Slop and pasture aren't always well-rounded, and I trust the pellet mixers to insure they're getting at least the basic nutritional balance better than I would.
Don't fall for their lies. If you've just fed them and know it's enough, it's enough. But make sure it's enough
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