Q: How Make an Upside-Down Version of an Existing Font?

The right way would be with the latest beta using the Glyph transform wizard. I did this one in half a dozen clicks.

Tools, Glyph Transformer, Outline, Mirror, Horizontal and Vertical, Range All, OK. One will then also need to shift some baselines, but most look OK.

This is how it looks in Preview after a rough and ready adjustment of the baselines: