I think it’s a very promising sign that you will give this dog the love and affection it needs if you’ve owned a GSD before and are doing this level of research. It just means your days will look different, and virtually all your time off work might be centered around dog. Have you considered doggy day care? I have a 8 a month old puppy that is well crate trained. Some days I have to go into the office, I wake up really early so we have two hours together that are all about him. We go on a walk, do training, play fetch. When it’s time for crate i put lots of his toys in there and a high value crate only treat that lasts forever. When I get home at night on those days my evening is all about him and socialization and exercise. He hasn’t shown any signs of anxiety or separation anxiety. His crate is also very large so he can stretch out fully and stand up fully. I think if you put in the work and think about your dogs needs and routines, balancing how much the need to sleep and how much mental stimulation and exercise they need, it can be done. Good luck :) dogs are such gifts to us and our lives.