Now there is a way to add existing SCORM-based content to Open edX, although not in the cleanest way because of the lack of an Xblock or a code integration. In addition, it might require some fixes to the edX code.
Nate Aune, founder of Appsembler.com, has described and suggested a solution by using a third party service called SCORM Cloud. This company wraps content that can be embedded into Open edX as an LTI component. For 3,000 registered students the price is $1,000/month.