You're most welcome.
Yeah, there are different types of corers if you want to take the centrepiece out. Just make sure you put the piece of cake back when you've filled it. Like in my link below...(I promise, even though it says cheesecake, the link shows how to core a cupcake).

Remember, less is more, so don't overfill them.
I am entirely incompetent when it comes to baking. My sisters birthday is coming up and I would like to combine her two favorite desserts, red velvet cupcakes and cheesecake. I can handle the boxed mix for the cupcakes, but I'd like to put a chunk of cheesecake into the middle of the cupcakes...
www.helpmebake.com
If you don't have a corer, you can also use a piping nozzle to cut out some cake, or if you have a more liquid type filling, you can use a bismark nozzle which is shown further down in the above cheesecake thread link.
Good luck with the cakes. I hope they turn out fabulous for you.
