Delicious and refreshing!
Absinthe and génépi (or other local alpine herb liqueurs like Iva (yarrows)) are very Swiss, whereas the base spirit and the bitters aren't that much.
If you can get hold of, consider substituting:
- herbs eau de vie, pome fruit eau de vie and/or kirsch(wasser) for gin
- gentian eau de vie for Peychaud's (and a little cherry liqueur or syrup for colour)