Thanks for the replies and advice. I'm under no great time pressure to get to Gstaad so I can hang around France or the flatter parts of Switzerland to wait for the cloud / wind in the hiller parts to improve.
I trained as a waiter in one of the grand hotels in Gstaad (the Bellevue) after my first year at university. On my days off, I would take my bike down to Saanen and watch the gliders, the F1 Avro and other props and jets come in and leave. It was terribly glamourous.
I loved the YouTube clips with the underwing camera. Any idea how that is achieved?