If you spend the day working with F-based applications, this may not be a solution. But if you require those keys for tasks like renaming files, etc it may be e

If you spend the day working with F-based applications, this may not be a solution. But if you require those keys for tasks like renaming files, etc it may be enough to configure SuperKeys on the Raise: keeping the key pressed for 250ms can trigger any other symbol, including the Fs. It might be more natural than switching layers.