So this might actually work, create a folder matching the corrupted image's folder in the real SXS, e.g. in my case amd64_microsoft-windows-microsoftedge_31bf3856ad364e35_10.0.10240.16397_none_19381f0c8accd5dd
Then put the image from this threat into that folder so you have something like:
Then pull up admin CMD and run:
Dism /Online /Cleanup-Image /RestoreHealth /Source:c:\temp\sxs /LimitAccess
Hopefully that restores the SxS copy and afterwards you can run SFC /scannow to repair the file under systemapps directory.