I was able to successfully do this last month for a trip to Vegas on CO. In fact, the CO rep at the Silver phone number recommended I do it. I booked his ticket using my OnePass account and miles. I then booked a ticket on the same flight in my name so that when I flew I would get the frequent flyer miles. Bonus, since I was not flying on a reward ticket, I was eligible for (and ended up getting) an EUA to First Class each way of the trip.