@apgagliardo
Your proposal has already been requested and discussed here. I don't think Windy is ready to develop the possibility of sending GRIB files over a restricted and chosen area, sending them by emailing via satellite.
This for 2 reasons:
Due to license agreement with ECMWF, Windy is not allowed to send data. Windy can only visualize it. With GFS it shouldn't be a problem, but for other models I don't know. Apps that do this have a special paid offer for sending GRIB files from the ECMWF model.
It would be necessary to develop a special viewer to use and view these GRIB files.
By the way, have you tried the Great Circle app?