I'll admit that I straight up don't know how the structural loading would be like - but I seems to be me that you might be able to get some sort of telescoping

I'll admit that I straight up don't know how the structural loading would be like - but I seems to be me that you might be able to get some sort of telescoping solution that works ok. Since you'd probably need to clear the containers anyways to get the most of the power out of the system, the lower portion of the sail doesn't need to be a rotor - just a mast for the rotor section to telescope over.