AnonPex is a command line utility program that can overwrite the Windows account name and computer name strings that get stored within compiled Papyrus scripts.
This sould work on both Skyrim and Skyrim Special Edition Papyrus scripts.
You can use it two ways:
Place the exe in the same folder as your pex files and double click it to run it.
Launch the exe from the command line and provide it with a directory containing pex files.
Backups will automatically be created. If it runs into a problem, it will ask if you want to quit or continue with the rest of the files.