" I would probably also bar it from the bedroom and designate a chair for it that I don’t like to sit in." (Sorry don’t know how to truly quote)…
You can probably bar it from the bedroom, but you’re going to have a heck of a time giving a cat one chair. Not trying to be a spoil sport, but with the allergies I want to warn you that it may not be simple. Cats are defiant. You’d probably be better off keeping them off all “human” furniture and getting a nice tree-type scratching post and possibly a bed for your new pet(s). My cat has a window seat that she simply adores. It’s a fake lamb’s wool and has a frame but no base to it (so it’s like a kitty hammock) and it’s where you’ll find her most of the time. The ones with a true platform (no hammock effect) she never liked as much.
Also, in my experiece, cats do tend to like “rough” fabrics that lodge their fur deep into them, so if you have any please think twice before bringing the cats into your home (but the micro-fiber materials are great - yes, cats like them, but their fur doesn’t sink in the way it does on more densely woven fabrics). It’ll take awhile to teach them what is not theirs.
I love cats, but I don’t want you having a horrible allergy attack and regretting your decision or despising your Feline Overlords should you choose to take one or more in.
That said, it sounds like you are already enjoying their company, even if from afar. Cats are great companions, so if you choose to keep one and train it for your needs (a water squirt bottle with a firm “no” to keep it off furniture), you’ll be pleased - these cats chose you, that’s how it normally goes!
Also, on the food - stay with the kibbles. Cats MUST have meat proteins (as found in commercial cat food) or they will die. They love the milk and cheese and some even fancy vegetables, but their main diet has to consist of cat-friendly food. Canned food is better as a treat (mostly because if you give it to them too much they will demand canned food only).
Keep us posted!