DH and I do something very similar to the clicker in that we snap our fingers at Kirby when issuing a command--it's just that extra attention-getter so he knows that we're addressing him and that we want something done, right away. However, Kirby is mostly German shepherd, so he's a very trainable, eager-to-please breed. Praise is typically his reward, with a treat thrown in here and there to keep him guessing. Like anything else with training, consistency is the key (on the heels of my last statement, I guess that seems pretty inconsistent, but the training book we got by one of the Monks of New Skete said not to do food rewards at all, so this is my compromise. Inconsistent, but it works in our situation, so no harm.). It may confuse them at first to bring the clicker into their routine, but once they see a consistent result for their behavior, they'll get it. I would also say it's really important to commit some time every day to working with them at first. Then you can make it a maintenance thing as they become accostomed to obeying commands issued in conjunction with the clicker. Beagles are stubborn, but they're also smart.
"Heroes are not giant statues framed against a red sky. They are people who say: This is my community, and it's my responsibility to make it better."-Tom McCall (Oregon governor from 1967-1975)