If someone else wants to do it, I'll be happy to help.
I think it's a small project. We've got a new node type in the grammar -- None -- and we'll need a new opcode -- LOAD_NONE. The compiler just needs to generate a LOAD_NONE for every None node.
I have hacked the interpreter loop before, but haven't changed the compiler yet. It's a nice oportunity to play with it, so I'll be glad to help, and accept your help as well. I'm going to study it more deeply tomorrow.