Limiting factor might be snow! Si Berry and Coatsey went out few years ago over xmas and couldnt get up to the crag. Essentially you go up on to a plateau and then drop into the valley itself and you often couldnt make it up to the top of the road! temps might be a little different now what with warming etc but it can be frigging cold there! Also camping is fucking grim there, unless your an alpine gnarler id get accom in a house. Having said that the conditions were best late Nov when the sun was out! You pays your money....
Thought about going further south?