There are two solutions posted on the forums, One a detailed description with pics of the bed being cut down to a queen, and the other is a project making more storage space under the bed. If I get a chance tomorrow I'll try to find them and post a link here.
Making the king bed is a pain. We put some thin self-stick tiles on the wood platform and it makes the mattress much easier to slide. When we do a full linen change, it takes both if us to do it. I bagged the original spread and shams for a washable type and just fold the top down and cover it up with the bigger pillows and shams.