Tagging your bags with the yellow DME tags and having your bags taken care of and delivered to your resort has always been available to anyone flying into MCO. The airline was never an issue. So, yes, you can use the DME baggage handling if you desire. Not going to be an issue.
Where it was an issue was your departure. SW, in the past, was not a 'participating airline' when it came to RAC (resort airline checkin). But now, SW participates in the RAC program...so no worries when using RAC to check your bags at your resort for your return flight.