I take the view that modern file names are human readable labels, not access keys.
“10kΩ Резисторы” is Cyrillic, Latin, and Greek (U+2126 canonically maps to U+03A9). A proposal that disallows that but allows “10kΩ Resistors” is a political non-starter.
The Unicode consortium has published recommendations with various security levels everybody enjoys to ignore. Following even the weakest level would be a starter, but not in current filesystems community. This needs to start in a new OS or with high profile spoofing attacks, such as on GitHub.
“10kΩ Резисторы” is Cyrillic, Latin, and Greek (U+2126 canonically maps to U+03A9). A proposal that disallows that but allows “10kΩ Resistors” is a political non-starter.