I wouldn't recommend compound chocolate in this application. It's not very good tasting and I only use compond chocolate sparingly when no one is going to eat much of it. How about using an inexpensive chocolate, for instance the 'Sams' Club' in my area sells a 10# bag of chocolate chips for around $7.oo (I beleive).
You realize that if it's totally hard (so it looks good for you) it will just break off in big chunks when the person cuts it? I don't quite know what you have in mind, but my first choice would be to glaze it instead of using chocolate. If I really wanted chocolate to flavor it, I'd use a marbled pound cake recipe instead, or put mini chocolate chips in your current recipe.
My two cents
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