Thanks for you input!

I did a hut trip this weekend with Aether, where I packed everything inside including the helmet. As expected it was not particularly comfortable, especially in places where I had to bootpack across bald patches, as Aether does not have a particularly good means for attaching skis. It skied a bit better than I feared though. 

After going over the options I decided to get myself a BD Cirque 45, partially because of the option of integrating Avalung, which I am still considering.

Thanks again.