Well 1-2 beers isn't really a lot. Does he always drink at a certain time like in the evenings after work or before sleep? If he isn't actively looking for an alternative to the beer, it may take him a while to want to switch to kava. When I decided to take an extended break from alcohol, it was after a couple years of drinking kava on and off so my comfort level with kava was very high. I would really recommend against benzos as an alternative. I've personally found them to be the most difficult substance to break away from. I don't hate them and think they have a valuable role treating some medical issues but daily use is playing with fire if there is any other alternative.
Kava Supreme is good but most batches aren't real strong on the mood uplift. The Vinaka waka might be a good second try. My recommendations would be a mix of Nangol and Supreme or Stone. Stone is, to me, the most complete kava available right now. It doesn't have the knock out potency that it used to have but it's a solid combination of mood lift and relaxation.