In the near future

I hope to start my lounge project. My room is 5.25m x 4.2m (or about 17' x almost 14'). My chimney breast is in the centre of the longer wall.
My wife had given me the ok to get as good a setup as I can (she's loosened the purse strings) but she preferred lifesytle/pod speakers. I had narrowed my search down to either Antony Gallo A'Diva ti's or B&W Mt 20/30.
Last night however, I stumbled across the XTZ reviews and to my complete amazement, my wife liked the 99.36 walnut floorstanders and the matching 99.26 centre.

Now these are big deep speakers (to what I am used to, and what I had been looking at buying) and therein lies the problem.
The tv will be mounted on the chimney breast, with a gas fire below. I know some people have issues with this but I have done enough research and I'm happy that the design of fireplace will not hinder the workings of the tv. For my original plan of having lifestyle speakers I was going to have a small mantle above the fire. This was to serve 2 purposes, the first it would act as a heat deflector
if the fire was ever to be on when watching the screen (this would be very rare, but I want to cover the possibilities), and the second reason for this was to set the left/centre/right speakers on.
Now I've been given the green light to go for a more conventional size centre, this idea will not work. I've now thought the only solution is to build a larger shelf
above the tv to hold the centre speaker. This will have to be a fairly deep shelf (about 40cm's max) and I'm afraid it will be too intrusive to the overall look we hope to achieve. Last night in bed I had a light bulb moment. What if I was to have a joiner install the shelf, and then put in a false chimney breast that will change the shape of the wall from flat to curved, and then set the centre into this curve.
Has anyone who has done similar point me to their setups for ideas, or how have others gotten over the problem of having a bookshelf speaker on a chimney breast.
I hope I've explained my thoughts well enough for you guys to get a picture of what I'm trying to achieve.
All ideas are welcome