Hi, I'm a snowboarder too, unfortunately living too far from Courmayer (Venice). Many years ago I went in Courmayer with a friend for a week and I took a guide for the famous Toula descent from Punta Hellbronner, Mt Blanc. Peraphs you can find other snowboarders directly there in the guide office, ask there.
Don't dare to go alone, one of the most famous italian snowboarders of the past, a local of Courmayer, lost is life there may years ago.
I hope you find other snowboarders to have some nice sessions there.