You may use Proxy (virtual) items which are not bound directly to the hardware, but are tagged for Alexa. Then you use a rule to update the item which is bond to your hardware.
You can create as many items as you want with different labels to have Alexa recognize those.
To use the new Alexa skill you need to setup your items the same way as Homekit items are set up:
http://docs.openhab.org/addons/io/homekit/readme.html and
Official Openhab skill for Alexa amazon echo available!