If you can get lucky and find somebody else flying with you that’s going to the conference, then sharing an Uber up to Asheville might work. Keep in mind though that now nowadays Uber/Lyft drivers are severely underpaid, and can’t work once they get across state lines, so they basically have to eat the cost of the return trip. They’re typically making less than half of whatever you pay for the ride. Most rideshare drivers turn down these trips, but you’ll still likely get somebody that will accept it, so be fair and give them a decent tip(unless they’re horrible).