Honestly, I wouldn't worry about waking him up. DS1 was a night wetter until about 7.5 I think. Our pediatrician was not worried AT ALL. It's a body maturity not something they are doing on purpose. And, it can be slower with boys. He said they don't even start worrying about it until 8 and even then they can talk about things like the alarm, but then start to check other causes first. That being said, we found out that DS1 was constipated (despite going daily) and had sleep apnea. Both of which can contribute to night time wetting. Once we got the constipation under control, the night wetting stopped almost immediately. DS hated that he needed to wear pull ups but he just couldn't stop. The pediatrician's favorite tool is this:
https://www.goodmix.com.au/product/bristol-stool-chart/. He said if stools aren't mostly #4 and sometime #3, then you have an issue which could be affecting nighttime wetting.