What we were able to do, is work with our manufacturer and install team to install a fully louvered shutter into the space. It required special work on the part of the design team and special fasteners and extra effort to install the project. The main issue was that the weight of the arch portion could affect the integrity of the shutter - because the bottom portion is not big enough to support the weight.
However, the extra effort paid off and the results were really spectacular. In our opinion, this is now the nicest looking window in the community.
We would love to help you with your project and we enjoy working through the issues to beautiful results. Also, check out our online shutter cost estimator.