Southwest Vacations doesn't accept LUV vouchers, but as you've noted, it's possible to book "dummy" flights on Southwest and then cancel, and use the resultant Travel Funds towards the airfare portion of your Southwest Vacations booking. Southwest Vacations (which is actually Mark Travel, a completely separate company from Southwest Airlines) only recently started accepting Southwest travel funds, so you might want to check with them regarding any limitations or conditions. Also, keep in mind that when you apply the vouchers the new reservation (and those funds once you cancel) will take on the expiration of the vouchers (all travel must be completed by that date), and also that the travel funds will be only usable by the passengers named in the "dummy" booking you make. If you were given the vouchers and credit a year ago, it may be approaching expiration quickly (or are already expired). Good luck.
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