Mixing beans, also known as blending, is common. The Cafe Verona from Starbucks is a blend.
I wouldn't mix a blend with a blend, but what you can do is pick up a couple different single origins and give that a try.
What is a single origin? It has a few definitions when you get into it, but basically it is a bag of coffee where all of the beans are from the same coffee growing region. You'll identify them clearly at Starbucks or a grocery store when they just say the name of the country on the bag, Brazil, Kenya, El Salvador, etc. Inside that bag are beans all from the label on the bag. Taking it to the next level, which I don't think you want to do here, but it's worth just a moment to clarify, is the term single origin in itself has deeper definition. A true single origin in some circles means all of the beans in that bag came from the same country, region, farm, harvest. Not all roasters adhere to this strict definition but rather just the highest level, same country.
Blending is usually optimal when you use single origins from different continents. For example, a blend of Ethiopian and Kenyan coffee isn't going to be as diverse as a blend of Brazilian and Ethiopian.
For what you describe, I'd recommend a Central American coffee blended with a Sumatra. That'll get you close to the Cafe Verona. For the Central American, I'd recommend El Salvador or a Nicaraguan if you can find it. Costa Rica is legit and much easier to find. Even a Mexican coffee like a Chiapas would be great, although not technically Central American.
50/50 blends are easiest, but not typical. This is where it takes some experimenting and where the less experienced folks truly appreciate a high quality roaster who knows and understands the world of coffee.
But hey, it's fun along the way to experiment with blends. You likely won't ruin the coffee if the blend is off, it just won't taste how you wanted it to. So it's back to the drawing board to try again, which in itself is all kinds of fun.
I'll stop now so you can absorb what I've typed so far. Ask any other questions you'd like. This is my passion.
-Mike