Is it possibly to have an options to set the copied/move files (on the PC) write protected?
Sure!
It's a simple windows thing.
Just right click on a folder with your images, select properties, and then check READ ONLY!
See screen snap attached.
It's not a good idea to do this to your only copy of images as you are effectively locking that folder which will not accept any "writes" of filters as you tweak your images.
Might be OK for a backup copy folder, perhaps.
Fred