Don't take it too hard. It's not a bad idea. I was underage when Tequiza hit the stores, so I tried a few of them very enthusiastically when it was all I could get. And I will say this...
The flavor combination has potential. Don't overdo it, but I think you could make something good. I'd lean towards something like some mild hops, like tetannananananger, slightly on the spicy side. It could be good.
Keep the flavor light because agave is a subtle flavor. An american lager is about ideal for this.. but a wheat beer could work too.
