My first thought would be to have a discussion with the Sumter County building inspector to see if they have any recommendations on options. my neighbor had a window removed and a door installed (similar to installing a larger window) and it was a messy project, no idea of the cost as it was part of a much bigger project. As I recall the lintel beam had to be replaced.
Have you considered enclosing a smaller area so that the escape window is not impacted?
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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