Swap Closed Eyes With Open

I have two high-resolution photos of the same subject: one has the perfect pose but their eyes are shut, the other has their eyes open in a very similar lighting and angle. All I need is a clean, natural-looking eye swap—no colour grading, skin retouching, or other tweaks. Please blend the open eyes from the second shot into the first so that no one can tell any editing was done. I’ll supply both RAW files (or high-quality JPEGs if you prefer) and would like the finished image back in layered PSD plus a flattened TIFF/JPEG for direct use. Let me know your turnaround time and anything else you need from me to get started.