I'm back with a Riff update.

After a month of exploring the local territory of the courtyard on a harness and leash for a month: I'm exceptionally pleased to announce that Riff is now an indoor/outdoor cat. She mastered the catflap really quickly and is a much happier girl. She comes inside covered in filth and cobwebs and has started "talking". She never made a peep when she was an indoor cat but now she pretty much won't shut up.
That is all. ☺