How do I handle a resident that refuses to have their brief changed cleaned up and into a new one?

I've been a caregiver for a few years now and I've never had a hard time with this, but one of the residents at my AL AFC is a 30/70% chance of letting me get him changed at night (NOC) and I am really wondering what to do. Redirection doesn't work. I've explained all the risks to refusal and really try to figure out why he doesn't want to, but it's usually a 'don't want to' and that's it. He has very limited mobility and a lot of chronic pain so it is very important to keep him as clean as we can. As there is only 1 person on NOC I do not have the ability to ask for assistance unless I were to wake my manager and drag them out. He isn't a difficult change but getting him to agree is very hard.