Personally, I wouldn’t try to pressurise him into accepting evolution. The thing about evolution is that it’s not an easy subject to understand, there are a lot of misconceptions about it, and some people get pretty grossed out at the thought of humans and animals being related to each other, especially if they’re the kind of people who hated biology lab work at school what with all the dissections and experiments with worms and maggots and all the rest of it.
Instead, focus on the need to make sure that you know what you’re talking about and that your facts are straight. The line I tend to adopt is that even if evolution is false, there are some really bad arguments against it — bad, as in, blatantly untrue, and that ultimately causes more harm to the Gospel than good.
My personal advice to pastors anywhere is to make sure that anyone teaching in their churches on the subject should have a degree in science at the very least. I could even handle being taught YEC by a trained scientist, since then I could at least have a rational and informed discussion with them. What gets up my nose are the people who gave up science at sixteen and haven’t set foot in a lab ever since, yet think that they know more about science than “secular scientists” because they haven’t been “brainwashed” by a science degree. These are the exact same people who believe that evolution teaches that cats can turn into dogs overnight, who aren’t even aware that radiometric dating involves measuring things, and who will happily tell you that that Sir Arthur Keith said something about evolution being unproven and unprovable four years after he died.