I think the wide grip barbell curl is fine for your elbows. I have never had an elbow problem from doing the wide grip barbell curl. My only suggestion would be to vary the amount of weight you lift. Don’t do little and light sets all week then go do a heavy set with low reps on the weekend. Instead, try lifting moderate amounts of weight for higher reps during your normal workouts, but cut back every once in a while to a lighter weight and higher rep range as well.