Yes, I think it would be. Of course beech isn't evergreen but it does look good over winter when it keeps its leaves until the new ones start to form. You might want to think about experimenting with cutting back some of the hawthorn very hard (perhaps one in every two or three plants) and seeing if it will re-shoot from near the ground - I think it probably will do. If it works you could do the same thing to some more the following year. Get bare rooted beech from a local nursery - much cheaper than in pots.