How about just letting it go dormant and keeping it in an unheated, but above freezing, location for the winter. If you have room in a basement or wherever just let the leaves brown off, put the pot in a corner and just give it a tiny bit of water once in a while. No light is necessary if it is dormant. If you need to save space you can even cut off the trunk near the base. The trunks are full of sticky latex that stains anything and everything it gets on so use caution. Just keep the pot above freezing and bring it out into the sunshine next summer. They quickly sprout from the roots.
