IIf though I was going to suggest a breed I would say, even though it's way over your size limit, a retired greyhound racer might be a really good fit. But again, I'm not sure this is the right time to add a dog if you don't have your family on board.
If one day you DO decide to investigate getting a dog, this might be the best and fairest option. The main reason we started looking at greyhounds was because we needed a quiet, low energy dog. I was still in vet school and my boyfriend had a full time job and isn't really INTO (read: likes them but doesn't want to do any work) dogs. We got Summit who was 5.5 years old at the time and had already been in a home for several years prior to being returned (no fault of his or his former owners, there was a cancer diagnosis). We knew when we got him that he was quiet, crate trained, house trained, liked to walk but not demanding for exercise. We have since added a puppy which is a whole different kettle of fish. But in general greyhounds are quite clean. They DO shed but they are a short coated breed and other than blowing their coats once or twice a year the shedding is generally minimal. They're typically very lazy dogs. Summit enjoys as many outings as you'll give him, but he also didn't suffer during my 3 weeks of exams when I would take him out 3-4 times a day for 5 minutes just to potty. I personally wouldn't recommend that as a long term schedule. And I could never do that with Kili who is very active.
I know lots of people do minimal activity with their greyhounds. They spend time loving on them at home but don't do a whole lot otherwise. And their greyhounds do great. Personally, I think it's a little weird to get a dog and not do anything with it beyond cuddle with it on the couch. I think the dogs enjoy having lives and doing stuff. I spend almost every spare moment I have with my dogs... hiking, training, playing. Why would you get a dog to not spend any time doing anything? Makes no sense to me, however I think that's pretty typical for the "average" home (or what I see to be average in my area anyway).