either join a dedicated renault forum,to see if any members have the correct lead/software to do the job,or a decent mobile auto locksmith who no doubt will be a lot cheaper then the stealers.
No, due to a security cock up a few years ago you can only get cards coded at Dealers. www.meganeownersclub.co.uk (you'll need to join BTW but its a free and popular Forum.)
I assume these cards are the same as for the Laguna.
I have an 06 Laguna and a Company Called Key Fax in Dukinfield can supply and code replacement cards.