Just an update for everyone, which might be helpful for others in this situation. I believe, that as Swiss residents (and thus not in the EU), we are eligible for Peugeot and Renault's lease buy back deals, wherein you just pay for the use of a brand new car for a minimum of 17/21 days respectively. It includes insurance (fully comp for anyone driving), 24 hour assistance, unlimited mileage and the price is totally fixed at the start.
http://europeforvisitors.com/peugeot-leases.htm http://europeforvisitors.com/renault-eurodrive.htm
Not the official websites, but useful starting points. Only Swiss pick up points are Zurich and Geneva as far as I can tell, but for long term renting, this is probably OK for people...
Anyway, if anyone has any experience using these services, please let me know - I'd be keen to hear any advice, trouble, pros/cons etc.
Thanks.