When should I start letting my new 1 year old dog self settle at night and not worry about the soiling?

Hello all. Brand new dog dad, and this is my second post. As its always difficult to find the perfect advice online sometimes.

For some background. My wife and myself recently re-homed a 1 year old pomeranian. He's pretty well behaved, very affectionate and all round good dog. The issue is, his breeder re-homed him at 1 year and he kind of lost those initial behaviours training months. That being self settling when he wakes up in the night. We've tried to keep a schedule of 4 hour toilet breaks, unless he's acting like he need to go out. And then we take him outside. We feed him at 4:30pm, so he can empty out before bed. He does usually go pee a couple times before bed, and the occasional poop. But hes still waking up in the night to go out. The difficulty is he has soiled his bed before in thr crate and we don't want him to think that's ok to do. The crate isn't too big, about the size of his bed. We are more comfortable with him now, but still dont feel comfortable leaving him to cry out at night. We've only had him a couple weeks so its early days, just any insight people have with re-homed dogs would be great!

Also to add insult to injury, he jumped off the sofa and broke his arm so, he's not really allowed to walk on it longer than a toilet break at a time. So we're even more aware of him crying.

Thank you!