Sorry Maltese Falcon, didn't see your article before I posted mine. All the best with your efforts.
I've signed the petition, I hope it has some effect. Personally, I think a more effective way would be to organise a coordinated campaign against the Maltese tourism industry.
Start by writing to all tour operators who include Malta in their brochures, and ask them to remove the island as a destination until illegal hunting is stopped. Follow this up with a leafleting campaign outside the doors of their high street shops. Make sure there is press coverage. Make sure Malta is associated in people's minds with gory photos of dead birds. Have a slogan like "Fly to Malta - no need to buy a return ticket" above a bleeding Honey Buzzard.
If local people with interests in the tourism industry feared for their businesses, they would almost certainly lobby the government to deal with the issue. The key to this is money.